The History of a Mouthful of Bread

J >> Jean Mace >> The History of a Mouthful of Bread

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Now our body also is a mansion, and has its steward too. But what a
steward--how active! what a universal genius I how inefficient by
comparison are the stewards of the greatest lords! He goes, he comes,
he is everywhere at once; and this really, and not as we use the phrase
in speaking of a merely active man: for the _being everywhere at
once_ is in this case, a fact. He keeps everything, not in a
storehouse, but what is far better, in his very pockets, which he
empties by degrees as he goes about, distributing their contents without
ever making a mistake, without stopping, without delaying; and returns
to replenish his resources in a ceaseless, indefatigable course, which
never flags, night nor day. And you can form no idea how many workmen
he has under his orders, all laboring without intermission, all
requiring different things--not one of them pausing, even for a
joke!--not even to say--"Wait a moment;"--they do not understand what
waiting means: he must always keep giving, giving, giving. By and by
we shall have a long account to give of this wonderful steward, whose
name, be it known, if you have not already guessed it, is Blood.

It is he who, one fine day when he was making his round of the jaws,
found those little germs I spoke of, awake and eager for work; and he
began at once to start them with materials. He knew that phosphorus
and lime were what they needed: he drew phosphorus and lime therefore
out of his pockets,--and, to be very exact, some other little matters
too,--but these were the most important; but I cannot stop to tell you
everything at once.

Now, where did the blood obtain this phosphorus and lime?

I expected you to ask this, but if you want everything explained as
we go along, we shall not get very far. In fact, if I answer all your
questions I shall be letting out my secret too soon, and telling you
the end of my story almost before it is begun.

So be it, however; perhaps you will feel more courage to go on, when
you know where we are going.

The steward of a country-house distributes tiles, planks, paint, bricks,
lime; but none of these things are his own, as you know; he has received
them from his master: and, in the same way, our steward has nothing
of his own: everything he distributes comes from the master of the
house, and as I have already told you, this master is the stomach. As
fast as the steward distributes, therefore, must the master renew the
stores--and renew them all, for unless he does this, the work would
stop. In proportion as the blood gives out on all sides the contents
of his pockets, the stomach must replenish them, and fill them with
everything necessary, or there would be a revolution in the house.
Now, as there can be nothing in the stomach but what has got into it
by the mouth, it behooves us to put into the mouth whatever is needed
for the supply of our numerous workmen; and this is why we eat.

I perceive that I have plunged here into an explanation out of which
I shall not easily extricate myself, for I can guess what you are going
to say next. When you began to cut your teeth, you had eaten neither
phosphorus nor lime, as nothing but milk had entered your mouth.

That is true. Neither then, nor since then, have you eaten those things,
and what is more, I hope you never will. And yet both must have got
into your mouth, for without them your teeth could never have grown.
How are we to get out of this puzzle?

Suppose now, for a moment, that instead of phosphorus and lime,
thelittle workmen in your jaws had asked the blood for sugar to make the
teeth with. Fortunately this is only a supposition; otherwise I should
be in great fear for the poor teeth: they would not last very long.
Suppose, further, that instead of your eating the lump of sugar which
was destined to turn into a tooth, your mamma had melted it in a glass
of water, and had given it to you to drink; you could not say you had
eaten sugar, and yet the sugar would really have got into your stomach,
and there would be nothing very wonderful if the stomach had found it
out and given it to the blood, and the blood had carried it off to the
place where it was wanted. Now, allowing that the lump of sugar was
very small, and the glass of water very large, the sugar might have
passed without your perceiving it, and yet the tooth would have grown
all the same, and without the help of a miracle.

And this is how it was. In the milk which you drank as a baby there
were both phosphorus and lime, though in very small quantities. There
were many other things besides; everything of course that the blood
required for the use of its work-people, because at that time the
stomach was only receiving milk, and yet all the work was going on as
usual.

And therefore, my dear child, whenever in the course of our studies,
you hear me describe such and such a thing as being within us, say
quietly to yourself, "that also was in the milk which nourished me
when I was a baby."

Of course, the same things are in what you eat now; only now they come
in a form more difficult to deal with, and the labor of detaching them
from the surrounding ingredients is much greater. The whole business
indeed of this famous machine which we are studying consists in
unfastening the links which hold things together, and in laying aside
what is useful, to be sent to the blood divested of the refuse. The
stomach was too feeble in your infancy to have encountered the work
it has to do now. It is for this reason that God devised for the benefit
of little children that excellent nourishment--milk--which contains,
all ready for use, every ingredient the blood wants; and is almost,
in fact, blood ready made.

Only think, my child, what you owe to her who gave you this nourishment!
It was actually her blood she was giving you; her blood which entered
into your veins, and which wrought within you in the wonderful way
which I have been describing. Other people gave you sugar-plums, kisses,
and toys; but she gave you the teeth which crunched the sugar-plums,
the flesh of the rosy cheeks which got the kisses, and of the little
hands which handled the toys. If ever you can forget this, you are
ungrateful indeed!

Now, beware of going on to ask me how we know that there are so many
sorts of things in milk, or I shall end by getting angry. Question
after question; why, you might drive me in this way to the end of the
world, and we should never reach the point we are aiming at. We have
already traveled far away from the teeth, concerning which I wanted
to talk to you at this time, but our lesson is nearly over and we have
scarcely said a word about them! One cannot learn everything at once.
Upon the point in question you must take my word; and as you may
believe, I would not run the risk of being contradicted before you,
by those who have authority on the subject.

Let it suffice you, for to-day, to have gained some idea of the manner
in which the materials which constitute our bodies are manufactured
within us. We have got at this by talking of the teeth; to-morrow, it
may be the saliva, the next day something else. What I have now told
you will be of use all the way through, and I do not regret the time
we have given to the subject. If you have understood that well; the
time has not been lost.

LETTER V.

THE TEETH _(continued.)_

My thoughts return involuntarily to the subject I last explained to
you, my dear child, and I find that I have a great deal to say about
it still.

You see now, I hope, that we have something else to consult besides
a dainty taste when we are eating; and that if we are to work to any
good purpose we must think a little about this poor blood; who has so
much to do, and who often finds himself so much at fault, when we send
him nothing but barley-sugar and biscuits for his support. It is not
with such stuff as that, as you may well imagine, that he can be enabled
to answer satisfactorily to the constant demands of his little workmen,
and we expose him to the risk of getting into disgrace with them, if
we furnish him with no better provisions.

And who is the sufferer? Not I who am giving you this information,
most certainly.

Now, when children hesitate about eating plain food, and fly from beef
to rush at dessert, they act as a man would do who should begin to
build by giving his workmen reeds instead of beams, and squares of
gingerbread instead of bricks. A pretty house he would have of it;
--just think!

On the contrary, what your mother asks you to eat, my dear little
epicure, is sure to be something which contains the indispensable
supplies for which your blood is craving; for people knew all about
this by experience long before they could explain the why and the
wherefore. But now that you are so much better informed than even the
most learned men were a century ago, pouting and wry faces at table
are no longer excusable, and I should be sadly ashamed of you if I
should hear you continued to make them.

And this is what I was more particularly thinking of just now, when
I took up my pen again. No doubt it is very amusing to be able to look
clearly into one's frame, and see what goes on inside, but the amusement
anything affords is the least important part of it; you have begun to
find this out already, and you will find it out more and more every
day. What seems to me one of the great advantages of the study we have
begun together is, that at every step you take you will meet with the
most practical and useful instruction, as well as the most unanswerable
reasons for doing what your parents ask you to do every day.

To obey without knowing why is certainly possible, and may be done
happily enough. But we obey more readily and easily when we understand
the reason for doing so; and a duty which one can satisfy oneself
about, forces itself upon one as a sort of necessity. And what can
throw a stronger light on our duties than a thorough acquaintance with
ourselves?

It is upwards of two thousand two hundred years ago (and that is not
yesterday, you must own!) since one of the greatest minds of the
world--Socrates--never forget that name--taught his disciples, as a
foundation precept, this apparently simple maxim, "Know thyself." He
meant this, it is true, in a much higher sense than we are aiming at
in these conversations of ours, but his rule is so practical, that
although you have only as yet taken a mere peep into one small corner
of self-knowledge, you find, if I am not much mistaken, that your heart
has beaten once or twice rather faster than it did before. Was I wrong,
in saying from the beginning, that we become better as we grow in
knowledge? Is it not true that you have felt more tenderly than ever
towards her who nourished you with her milk, since I explained to you
the value of milk; and that you have kissed your mother's hand all the
more lovingly since you heard my history of the hand? To tell you the
truth, if you had not done so, I should have been dissatisfied both
with you and myself.

And wait! While we are talking thus, another thought has come into my
head about hands and nurses, which I must tell you of.

There is something of the nurse, my child, in those who take the best
fruits of their intellect and heart, and transform them, as it were,
into milk, in order that your infant soul may receive a nourishment
it will be able to digest without too much effort. In this way their
very soul enters into you, and it is but fair that you should reward
them as they deserve. Young as you are, too, you have a recompense in
your power: one more acceptable even than Academic prizes--of which
it is indispensable not to be too avaricious--you can give them your
love.

Besides, it is not only hands but heads that are at work for you, and
of these many more than you suppose; and your debt of gratitude is as
much due to the one as to the other.

Perhaps my first letter may have led you to suppose that I was inclined
to laugh at what I called learned men; and they are perhaps a little
to blame for not thinking often enough about little girls; but
nevertheless these men are of the greatest use to them in an indirect
way. You owe them much, therefore, and without them could have known
nothing of what I am teaching you. It is very grand for us, is it not,
to know that there is phosphorus and lime in our teeth? But it took
generations of learned men, and investigations and discoveries without
end, and ages of laborious study, to extract from nature this secret
which you have learnt in five minutes. And whatever others you may
learn hereafter, remember that it is the same story with all. While
profiting, therefore, at your ease, by all these conquests of science,
I would have you hold in grateful recollection those who have gained
them at so much cost to themselves: almost always at the expense of
their fortune, sometimes at the peril of their lives.

There they are, observe, a little knot of men with no sort of outward
pretension. They speak a language which scares children away. They
weigh dirty little powders in apothecaries' scales; steep sheets of
copper in acid-water; and watch air-bubbles passing through bent glass
tubes, some of which are as dangerous as cannon balls. They scrape old
bones, and slice scraps no bigger than a pin's head. They keep theireyes
fixed for hours upon things they are examining through microscopes
of a dozen glasses, and when you go to see what they are looking at,
you find nothing at all. To see them at work, in what they call their
laboratories, you would say that they were a set of madmen. But at the
end, it is found, some fine day, that they have changed the face of
the earth; have worked revolutions before which emperors and kings bow
in respect; have enriched nations by millions at a time; have revealed
to the human race, divine laws of which it had hitherto been ignorant;
finally, have furnished the means of teaching little boys and girls
some very curious things, which will make them more agreeable as well
as reasonable. And this is a benefit not to be despised, since these
children are destined one day to become fathers and mothers, and so
to govern the next generation; and the better they themselves are
instructed, the better this will be done.

But now let us go back to the poor teeth, whom we seem to have forgotten
altogether. However, we knew very well that they would not run away
meantime.

I told you before that it was their business to dress and prepare
whatever was presented to them, but the reception they bestow is not
one which would suit every body's taste, for it consists in being made
mince-meat of And in order to do their work in the best way possible
they divide their labor; some cut up, others tear, and others pound.

First, there are those flat teeth in front of the two jaws, just below
the nose. Touch yours with the tip of your finger; you will find that
they terminate in sharp-edged blades, like knives. These are called
_incisors,_ from the Latin word _incidere,_ which means to cut, and it
is with them we bite bread and apples, where the first business is to
cut. It is with the same teeth that lazy little girls bite their thread,
when they will not take the trouble to find their scissors; and, by the
by, this is a very bad trick, because by rubbing them one against
another in this manner we wear them out, and, as you will soon discover,
worn-out teeth never grow again.

The next sort are those little pointed teeth, which come after the
_incisors,_ on each side of both jaws. You will easily find them;
and if you press against them a little, you will feel their points.
If we call the first set the knives of the mouth, we may call these
its forks. They serve to pierce whatever requires to be torn, and they
are called _canine_ teeth, from the Latin word _canis_, a dog, because
dogs make great use of them in tearing their food. They place their paws
upon it, and plunging the canine teeth into it, pull off pieces by a
jerk of the head. Look into the mouth of papa's dog: you will recognize
these teeth by their rather curved points. They are longer than the
rest, and are called fangs. I do not know, after all, why they have
chosen to name these teeth _canine_, as all carnivorous animals have the
same fangs, and in the lion, the tiger, and many other species, they are
much more developed and sharper than in the dog. In cats they are like
little nails. However, the name is given, and we cannot alter it.

The last teeth, which are placed at the back of the jaw, are called
molars, from the Latin word _mola_, which means a millstone.

You must be prepared to meet with several Latin words as we go on; but
never mind; this will give you the opportunity of learning a little
Latin, and so of keeping your brother in order, if he ever looks down
upon you because he is learning Latin at school. Formerly, all learned
men wrote in Latin, and as they ruled supreme in all such subjects as
those we are discussing, they gave to everything such names as they
pleased, without consulting the public, who did not just then trouble
their heads about the matter. Now they give Greek names, which can
hardly be called an improvement; but if they ever wish to attract the
attention of little girls they must translate their hard words into
our own language.

To return to our grinders: they perform the same office as a miller's
millstone; that is to say, they grind everything that comes in their
way. These teeth have flat, square tops, with little inequalities on
the surface, which you can feel the moment you lay your finger on them.
These are the largest and strongest of the three sets, and with them
we even crack nuts, when we prefer the risk of breaking our teeth to
the trouble of looking for the nut-crackers!

Now, I will answer for it that you cannot explain to me why we always
place what is hard to break between the _molars,_ and never employ
the _incisors_ in the work? And yet everybody does this alike--from
the child to the grown-up man--and all equally without thinking of
what they are doing.

I will tell you the reason, however, if you will first tell me why,
when you are going to snip off the tip of your thread (which offers
very little resistance), you do it with the point of your scissors;
whereas you put any tough thing which is likely to resist strongly (a
match, for instance) close up to their hinge; particularly if you have
no scruple about spoiling the scissors, by the way!

If you were a grown-up lad, and I were teaching you natural philosophy,
I should have here a fine opportunity for explaining what is called
_the theory of the lever_. But I think _the theory of the lever_ would
frighten you; so we must get out of the difficulty in some other way.

I find, however, that I have been joking so much as I went along, that
I have but little space left, and feel quite ashamed of myself. We
seem quite unlucky over these teeth.

I have already been scolded by people who are not altogether wrong in
accusing me of losing my time in chattering, first of one thing and
then of another. They complain that by thus nibbling at every blade
of grass on the way-side we shall never get to the end of our journey;
and there is some truth in what they say. Still, I will whisper to you
in excuse that I thought we might play truant a little bit while we
were on familiar ground, where naturally you were sure to feel a
particular interest in everything. The hand, the tongue, the
teeth--these are all old friends of yours--and I thought you would
like to hear all about them. By-and-bye we shall be in the little black
hole, and then we shall get on much more rapidly.

LETTER VI.

THE TEETH _(continued)._

I left off at the _molars_, which are the teeth one selects to
crack nuts with; and if I remember rightly, we talked about different
ways of cutting with scissors.

Let us look at the subject from a distance, that we may understand it
more clearly. Let us imagine a horse drawing a heavy cart slowly along.
Ask it to gallop, and it will answer, "With all my heart! but you must
give me a lighter carriage to draw." And now fancy another flying over
the ground with a gig behind it. Ask it to exchange the gig for the
cart, and it will say, "Yes; but then I shall have to go slowly."

Whereby you see that with the same amount of strength to work with,
one has the choice of two things: either of conquering a great
resistance slowly, or a slight one quickly.

And it is partly on this account, dear child, that I teach you so
gradually; for young heads, fresh to the work, are less easily drawn
along than others, and have but a certain amount of strength.

Hitherto all has been clear as the day. Now take your scissors in your
left hand; hold the lower ring of the handle firmly between your thumb
and closed hand, so that the blade shall remain straight and immovable:
then with your other hand cause the upper ring to go up and down, and
watch the blade as it moves. The whole of it moves at once, and is put
in motion by the same power--viz., your right hand. But the point makes
a long circuit in the air, while the hinge end makes only a very little
one--indeed, moves almost imperceptibly: and, as you may imagine, a
different sort of effort is required from the motive power (your hand)
according as resistance is made at the point or at the hinge. The point
goes full gallop: it is the horse in the gig; the light work is for
him. The hinge moves slowly; it is the cart-horse, and takes the heavy
labor.

I hope I have made you understand this, for it explains the cracking
of our nut, though you may not suspect it. Move your scissors once
more in the same way. Now, you have before you the pattern of the two
jaws on one side of your face, from the ear to the nose; the upper
one, which never moves (as you may convince yourself by placing a
finger on your upper lip when you either speak or eat), and the lower
one which goes up and down. Two pairs of scissors set points to points
give you the whole jaw. The _incisors_ are at the points, they
gallop up and down, and are worthless for doing hard work; the
_molars_ are at the hinges, and move slowly; and if anything tough
has to be dealt with, it comes to them as a matter of course; hence
they are the nutcrackers. You must own that it is pleasant to reflect
thus upon what we are doing every day, and the next time you see a
stonemason moving stones of twenty times his own weight with his iron
bar, ask your papa to explain to you the principle of the lever. After
what I have told you, you will understand it very readily, or at least
enough of it to satisfy your mind.

But, besides this power of moving up and down, the lower jaw possesses
another less obvious one, by means of which it goes from right to left.
This is precisely what naughty children make use of when they grind
their teeth: not that I mean this remark for you, for I have a better
opinion of you than to suppose you do such things. Those who make such
bad use of their jaws deserve to lose the power of ever moving them
thus, and then they would find themselves sadly at a loss how to chew
their bread--for their _molars_ would be of but little service
to them in such a case; as it is chiefly by this second action of the
jaw that the food is pounded. Try to chew a bit of bread by only moving
your jaw up and down, and you will soon tire of the attempt.

One word more to complete my description of the teeth: that portion
of them which is in the jaw is called the _root_; and the _incisors_,
which cannot work hard because, like the gig-horses, they have but
little resisting power, possess only small and short roots; whereas the
_canines,_ whose duty it is to tear the food sideways, would run the
risk of being dragged out and left sticking in the substances they are
at work upon, if they were not well secured; these, therefore, have
roots which go much deeper into the jaw, and in consequence of this they
give us more pain than the others when the dentist extracts them: those
famous _eye-teeth_, which so terrify people on such occasions, are the
_canines_ of the upper jaw, and lie, in fact, just below the eye.

The _molars_ meanwhile would be in danger of being shaken in the
sideway movement, while chewing: so they do as you would do if you
were pushed aside. Now you would throw out your feet right and left
in order to steady yourself, and thus the molars, which have always
two roots, throw them out right and left for the same purpose. Some
have three, some four, and they require no less for the business they
have to do.

Above the root comes what is called the crown; that is the part of the
tooth which is exposed to the air; the part which does the work, and
which bears the brunt of all the rubbing. Now, however hard it may be,
it would soon end in being worn out by all this fun if it were not
covered by a still harder substance, which is called _enamel_.
The _enamel_ which forms the coating of china plates, and which
you can easily distinguish by examining a broken plate, will give you
a very exact idea of it. It is this enamel which gives the teeth the
polish and brilliancy we so much admire, and it is desirable to be
very careful of it, not out of vanity, though there is no objection
to a little vanity on the subject, but because the enamel is
the protector of the teeth, and when that is destroyed, you may say good-
bye to the teeth themselves. All acids eat into the enamel, as vinegar or
lemon-juice does into marble; and one of the best means of preserving
this protecting armor of the teeth is never to eat the unripe windfalls
of fruit, which I have seen unreasonable children pick up in orchards
and devour so recklessly. They give sufficient warning, by their
acidity, that they are not fit for food, and when this warning is
neglected, they take their revenge by corroding the enamel of the
teeth; not to speak of the disturbance which they afterwards cause in
the poor stomach.

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