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Lamarck, the Founder of Evolution

A >> Alpheus Spring Packard >> Lamarck, the Founder of Evolution




[106] _History and Methods of Paleontological Discovery_ (1879), p. 23.




CHAPTER X

LAMARCK'S OPINIONS ON GENERAL PHYSIOLOGY AND BIOLOGY


Lamarck died before the rise of the sciences of morphology, embryology,
and cytology. As to palaeontology, which he aided in founding, he had but
the slightest idea of the geological succession of life-forms, and not
an inkling of the biogenetic law or recapitulation theory. Little did he
know or foresee that the main and strongest support of his own theory
was to be this same science of the extinct forms of life. Yet it is a
matter of interest to know what were his views or opinions on the nature
of life; whether he made any suggestions bearing on the doctrine of the
unity of nature; whether he was a vitalist or not; and whether he was a
follower of Haller and of Bonnet,[107] as was Cuvier, or pronounced in
favor of epigenesis.

We know that he was a firm believer in spontaneous generation, and that
he conceived that it took place not only in the origination of his
primeval germs or _ebauches_, but at all later periods down to the
present day.

Yet Lamarck accepted Harvey's doctrine, published in 1651, that all
living beings arose from germs or eggs.[108]

He must have known of Spallanzani's experiments, published in 1776, even
if he had not read the writings of Treviranus (1802-1805), both of whom
had experimentally disproved the theory of the spontaneous generation of
animalcules in putrid infusions, showing that the lowest organisms
develop only from germs.

The eighteenth century, though one of great intellectual activity, was,
however, as regards cosmology, geology, general physiology or biology, a
period of groping in the dim twilight, when the whole truth or even a
part of it was beyond the reach of the greatest geniuses, and they could
only seize on half-truths. Lamarck, both a practical botanist,
systematic zooelogist, and synthetic philosopher, had done his best work
before the rise of the experimental and inductive methods, when direct
observation and experiments had begun to take the place of vague _a
priori_ thinking and reasoning, so that he labored under a disadvantage
due largely to the age in which he lived.

Only the closing years of the century witnessed the rise of the
experimental methods in physics and chemistry, owing to the brilliant
work of Priestley and of Lavoisier. The foundations of general
physiology had been laid by Haller,[109] those of embryology to a
partial extent by Wolff,[110] Von Baer's work not appearing until 1829,
the year in which Lamarck died.

_Spontaneous Generation._--Lamarck's views on spontaneous generation are
stated in his _Recherches sur l'Organisation des Corps vivans_ (1802).
He begins by referring to his statement in a previous work[111] that
life may be suspended for a time and then go on again.

"Here I would remark it (life) can be produced (_preparee_) both by
an organic act and by nature herself, without any act of this kind,
in such a way that certain bodies without possessing life can be
prepared to receive it, by an impression _which indicates in these
bodies the first traces of organization_."

We will not enter upon an exposition of his views on the nature of
sexual generation and of fecundation, the character of his _vapeur
subtile_ (_aura vitalis_) which he supposes to take an active part in
the act of fertilization, because the notion is quite as objectionable
as that of the vital force which he rejects. He goes on to say, however,
that we cannot penetrate farther into the wonderful mystery of
fecundation, but the opinions he expresses lead to the view that
"nature herself imitates her procedures in fecundation in another state
of things, without having need of the union or of the products of any
preexistent organization."

He proceeds to observe that in the places where his _aura vitalis_, or
subtle fluid, is very abundant, as in hot climates or in heated periods,
and especially in humid places, life seems to originate and to multiply
itself everywhere and with a singular rapidity.

"In this high temperature the higher animals and mankind develop and
mature more rapidly, and diseases run their courses more swiftly;
while on the other hand these conditions are more favorable to the
simpler forms of life, for the reason that in them the orgasm and
irritability are entirely dependent on external influences, and all
plants are in the same case, because heat, moisture, and light
complete the conditions necessary to their existence.

"Because heat is so advantageous to the simplest animals, let us
examine whether there is not occasion for believing that it can
itself form, with the concourse of favorable circumstances, the
first germs of animal life.

"_Nature necessarily forms generations, spontaneous or direct, at
the extremity of each organic kingdom or where the simplest organic
bodies occur._"

This proposition, he allows, is so far removed from the view generally
held, that it will be for a long time, and perhaps always, regarded as
one of the errors of the human mind.

"I do not," he adds, "ask any one to accord it the least confidence
on my word alone. But as surely it will happen, sooner or later,
that men on the one hand independent of prejudices even the most
widespread, and on the other profound observers of nature, may have
a glimpse of this truth, I am very content that we should know that
it is of the number of those views which, in spite of the prejudices
of my age, I have thought it well to accept."

"Why," he asks, "should not heat and electricity act on certain matters
under favorable conditions and circumstances?" He quotes Lavoisier as
saying (_Chemie_, i., p. 202) "that God in creating light had spread
over the world the principle of organization of feeling and of thought";
and Lamarck suggests that heat, "this mother of generation, this
material soul of organized bodies," may be the chief one of the means
which nature directly employs to produce in the appropriate kind of
matter an act of arrangement of parts, of a primitive germ of
organization, and consequently of vitalization analogous to sexual
fecundation.

"Not only the direct formation of the simplest living beings could
have taken place, as I shall attempt to demonstrate, but the
following considerations prove that it is necessary that such
germ-formations should be effected and be repeated under favorable
conditions, without which the state of things which we observe could
neither exist nor subsist."

His argument is that in the lower polyps (the Protozoa) there is no
sexual reproduction, no eggs. But they perish (as he strangely thought,
without apparently attempting to verify his belief) in the winter. How,
he asks, can they reappear? Is it not more likely that these simple
organisms are themselves regenerated? After much verbiage and
repetition, he concludes:

"We may conceive that the simplest organisms can arise from a minute
mass of substances which possess the following conditions--namely,
which will have solid parts in a state nearest the fluid conditions,
consequently having the greatest suppleness and only sufficient
consistence to be susceptible of constituting the parts contained in
it. Such is the condition of the most gelatinous organized bodies.

"Through such a mass of substances the subtile and expansive fluids
spread, and, always in motion in the milieu environing it,
unceasingly penetrate it and likewise dissipate it, arranging while
traversing this mass the internal disposition of its parts, and
rendering it suitable to continually absorb and to exhale the other
environing fluids which are able to penetrate into its interior, and
which are susceptible of being contained.

"These other fluids, which are water charged with dissolved
(_dissous_) gas, or with other tenuous substances, the atmospheric
air, which contains water, etc., I call containable fluids, to
distinguish them from subtile fluids, such as caloric, electricity,
etc., which no known bodies are believed to contain.

"The containable fluids absorbed by the small gelatinous mass in
question remain almost motionless in its different parts, because
the non-containable subtile fluids which always penetrate there do
not permit it.

"In this way the uncontainable fluids at first mark out the first
traces of the simplest organization, and consequently the
containable fluids by their movements and their other influences
develop it, and with time and all the favorable circumstances
complete it."

This is certainly a sufficiently vague and unsatisfactory theory of
spontaneous generation. This sort of guess-work and hypothetical
reasoning is not entirely confined to Lamarck's time. Have we not, even
a century later, examples among some of our biologists, and very eminent
ones, of whole volumes of _a priori_ theorizing and reasoning, with
scarcely a single new fact to serve as a foundation? And yet this is an
age of laboratories, of experimentations and of trained observers. The
best of us indulge in far-fetched hypotheses, such as pangenesis,
panmixia, the existence of determinants, and if this be so should we not
excuse Lamarck, who gave so many years to close observation in
systematic botany and zooelogy, for his flights into the empyrean of
subtle fluids, containable and uncontainable, and for his invocation of
an _aura vitalis_, at a time when the world of demonstrated facts in
modern biology was undiscovered and its existence unsuspected?

_The Preexistence of Germs and the Encasement Theory._--Lamarck did not
believe in Bonnet's idea of the "preexistence of germs." He asks whether
there is any foundation for the notion that germs "successively develop
in generations, _i.e._ in the multiplication of individuals for the
preservation of species," and says:

"I am not inclined to believe it if this preexistence is taken in a
general sense; but in limiting it to individuals in which the
unfertilized embryos or germs are formed before generation. I then
believe that it has some foundation.--They say with good reason," he
adds, "that every living being originates from an egg.... But the
eggs being the envelope of every kind of germ, they preexist in the
individuals which produce them, before fertilization has vivified
them. The seeds of plants (which are vegetable eggs) actually exist
in the ovaries of flowers before the fertilization of these
ovaries."[112]

From whom did he get this idea that seeds or eggs are envelopes of all
sorts of germs? It is not the "evolution" of a single germ, as, for
example, an excessively minute but complete chick in the hen's egg, in
the sense held by Bonnet. Who it was he does not mention. He evidently,
however, had the Swiss biologist in mind, who held that all living
things proceed from preexisting germs.[113]

Whatever may have been his views as to the germs in the egg before
fertilization, we take it that he believed in the epigenetic development
of the plant or animal after the seed or egg was once fertilized.[114]

Lamarck did not adopt the encasement theory of Swammerdam and of Heller.
We find nothing in Lamarck's writings opposed to epigenesis. The
following passage, which bears on this subject, is translated from his
_Memoires de Physique_ (p. 250), where he contrasts the growth of
organic bodies with that of minerals.

"The body of this living being not having been formed by
_juxtaposition_, as most mineral substances, that is to say, by the
external and successive apposition of particles aggregated _en
masse_ by attraction, but essentially formed by generation, in its
principle, it has then grown by intussusception--namely, by the
introduction, the transportation, and the internal apposition of
molecules borne along and deposited between its parts; whence have
resulted the successive developments of parts which compose the body
of this living individual, and from which afterwards also result the
repairs which preserve it during a limited time."

Here, as elsewhere in his various works, Lamarck brings out the fact,
for the first time stated, that all material things are either
non-living or mineral, inorganic; or living, organic. A favorite phrase
with him is living bodies, or, as we should say, organisms. He also is
the first one to show that minerals increase by juxtaposition, while
organisms grow by intussusception.

No one would look in his writings for an idea or suggestion of the
principle of differentiation of parts or organs as we now understand it,
or for the idea of the physiological division of labor; these were
reserved for the later periods of embryology and morphology.

_Origin of the First Vital Function._--We will now return to the germ.
After it had begun spontaneous existence, Lamarck proceeds to say:

"Before the containable fluids absorbed by the small, jelly-like
mass in question have been expelled by the new portions of the same
fluids which reach there, they can then deposit certain of the
contained fluids they carry along, and the movements of the
contained fluids may apply these substances to the containing parts
of the newly organized microscopic being. In this way originates the
first of the vital functions which becomes established in the
simplest organism, _i.e._, nutrition. The environing containable
fluids are, then, for the living body of very great simplicity, a
veritable chyle entirely prepared by nature.

"Mutilation cannot operate without gradually increasing the
consistence of the parts contained within the minute new organism
and without extending its dimensions. Hence soon arose the second of
the vital functions, _growth or internal development_."

_First Faculty of Animal Nature._--Then gradually as the continuity of
this state of things within the same minute living mass in question
increases the consistence of its parts enclosed within and extends its
dimensions, a vital orgasm, at first very feeble, but becoming
progressively more intense, is formed in these enclosed parts and
renders them susceptible of _reaction_ against the slight impression of
the fluids in motion which they contain, and at the same time renders
them capable of contraction and of distention. Hence the origin of
_animal irritability_ and the basis of feeling, which is developed
wherever a nervous fluid, susceptible of locating the effects in one of
several special centres, can be formed.

"Scarcely will the living corpuscle, newly animalized, have received
any increase in consistence and in dimensions of the parts
contained, when, as the result of the organic movement which it
enjoys, it will be subjected to successive changes and losses of its
substance.

"It will then be obliged to take nourishment not only to obtain any
development whatever, but also to preserve its individual existence,
because it is necessary that it repair its losses under penalty of
its destruction.

"But as the individual in question has not yet any special organ for
nutrition, it therefore absorbs by the pores of its internal surface
the substance adapted for its nourishment. Thus the first mode of
taking food in a living body so simple can be no other than by
absorption or a sort of suction, which is accomplished by the pores
of its outer surface.

"This is not all; up to the present time the animalized corpuscle we
are considering is still only a primitive animalcule because it as
yet has no special organ. Let us see then how nature will come to
furnish it with any primitive special organ, and what will be the
organ that nature will form before any others, and which in the
simplest animal is the only one constantly found; this is the
alimentary canal, the principal organ of digestion common to all
except colpodes, vibrios, proteus (amoeba), volvoces, monads, etc.

"This digestive canal is," he says--proceeding with his _a priori_
morphology--"a little different from that of this day, produced by
contractions of the body, which are stronger in one part of the body
than in another, until a little crease is produced on the surface of
the body. This furrow or crease will receive the food. Insensibly
this little furrow by the habit of being filled, and by the so
frequent use of its pores, will gradually increase in depth; it will
soon assume the form of a pouch or of a tubular cavity with porous
walls, a blind sac, or with but a single opening. Behold the
primitive alimentary canal created by nature, the simplest organ of
digestion."

In like _a priori_ manner he describes the creation of the faculty of
reproduction. The next organ, he says, is that of reproduction due to
the regenerative faculty. He describes fission and budding. Finally
(p. 122) he says:

"Indeed, we perceive that if the first germs of living bodies are
all formed in one day in such great abundance and facility under
favorable circumstances, they ought to be, nevertheless, by reason
of the antiquity of the causes which make them exist, the most
ancient organisms in nature."

In 1794 he rejected the view once held of a continuous chain of being,
the _echelle des etres_ suggested by Locke and by Leibnitz, and more
fully elaborated by Bonnet, from the inorganic to the organic worlds,
from minerals to plants, from plants to polyps (our Infusoria), polyps
to worms, and so on to the higher animals. He, on the contrary, affirms
that nature makes leaps, that there is a wide gap between minerals and
living bodies, that everything is not gradated and shaded into each
other. One reason for this was possibly his strange view, expressed in
1794, that all brute bodies and inorganic matters, even granite, were
not formed at the same epoch but at different times, and were derived
from organisms.[115]

The mystical doctrine of a vital force was rife in Lamarck's time. The
chief starting point of the doctrine was due to Haller, and, as Verworn
states, it is a doctrine which has confused all physiology down to the
middle of the present century, and even now emerges again here and there
in varied form.[116]

Lamarck was not a vitalist. Life, he says,[117] is usually supposed to
be a particular being or entity; a sort of principle whose nature is
unknown, and which possesses living bodies. This notion he denies as
absurd, saying that life is a very natural phenomenon, a physical fact;
in truth a little complicated in its principles, but not in any sense a
particular or special being or entity.

He then defines life in the following words: "Life is an order and a
state of things in the parts of every body possessing it, which permits
or renders possible in it the execution of organic movement, and which,
so long as it exists, is effectively opposed to death. Derange this
order and this state of things to the point of preventing the execution
of organic movement, or the possibility of its reestablishment, then you
cause death." Afterwards, in the _Philosophie zoologique_, he modifies
this definition, which reads thus: "Life, in the parts of a body which
possesses it, is an order and a state of things which permit organic
movements; and these movements, which constitute active life, result
from the action of a stimulating cause which excites them."[118]

For the science of all living bodies Lamarck proposed the word
"Biology," which is so convenient a term at the present day. The word
first appears in the preface to the _Hydrogeologie_, published in 1802.
It is worthy of note that in the same year the same word was proposed
for the same science by G. R. Treviranus as the title of a work,
_Biologie, der Philosophie der lebenden Natur_, published in 1802-1805
(vols. i.-vi., 1802-1822), the first volume appearing in 1802.

In the second part of the _Philosophie zoologique_ he considers the
physical causes of life, and in the introduction he defines nature as
the _ensemble_ of objects which comprise: (1) All existing physical
bodies; (2) the general and special laws which regulate the changes of
condition and situation of these bodies; (3) finally, the movement
everywhere going on among them resulting in the wonderful order of
things in nature.

To regard nature as eternal, and consequently as having existed from all
time, is baseless and unreasonable. He prefers to think that nature is
only a result, "whence, I suppose, and am glad to admit, a first cause,
in a word, a supreme power which has given existence to nature, which
has made it as a whole what it is."

As to the source of life in bodies endowed with it, he considers it a
problem more difficult than to determine the course of the stars in
space, or the size, masses, and movements of the planets belonging to
our solar system; but, however formidable the problem, the difficulties
are not insurmountable, as the phenomena are purely physical--_i.e._,
essentially resulting from acts of organization.

After defining life, in the third chapter (beginning vol. ii.) he treats
of the exciting cause of organic movements. This exciting cause is
foreign to the body which it vivifies, and does not perish, like the
latter. "This cause resides in invisible, subtile, expansive,
ever-active fluids which penetrate or are incessantly developed in the
bodies which they animate." These subtile fluids we should in these days
regard as the physico-chemical agents, such as heat, light, electricity.

What he says in the next two chapters as to the "orgasme" and
irritability excited by the before-mentioned exciting cause may be
regarded as a crude foreshadowing of the primary properties of
protoplasm, now regarded as the physical basis of life--_i.e._,
contractility, irritability, and metabolism. In Chapter VI. Lamarck
discusses direct or spontaneous generation in the same way as in 1802.
In the following paragraph we have foreshadowed the characteristic
qualities of the primeval protoplasmic matter fitted to receive the
first traces of organization and life:

"Every mass of substance homogeneous in appearance, of a gelatinous
or mucilaginous consistence, whose parts, coherent among themselves,
will be in the state nearest fluidity, but will have only a
consistence sufficient to constitute containing parts, will be the
body most fitted to receive the first traces of organization and
life."

In the third part of the _Philosophie zoologique_ Lamarck considers the
physical causes of feeling--_i.e._, those which form the productive
force of actions, and those giving rise to intelligent acts. After
describing the nervous system and its functions, he discusses the
nervous fluid. His physiological views are based on those of Richerand's
_Physiologie_, which he at times quotes.

Lamarck's thoughts on the nature of the nervous fluid (_Recherches sur
le fluide nerveux_) are curious and illustrative of the gropings after
the truth of his age.

He claims that the supposed nervous fluid has much analogy to the
electric, that it is the _feu ethere_ "animalized by the circumstances
under which it occurs." In his _Recherches sur l'organisation des corps
vivans_ (1802) he states that, as the result of changes continually
undergone by the principal fluids of an animal, there is continually set
free in a state of _feu fixe_ a special fluid, which at the instant of
its disengagement occurs in the expansive state of the caloric, then
becomes gradually rarefied, and insensibly arrives at the state of an
extremely subtile fluid which then passes along the smallest nervous
ramifications in the substance of the nerve, which is a very good
conductor for it. On its side the brain sends back the subtile fluid in
question along the nerves to the different organs.

In the same work (1802) Lamarck defines thought as a physical act taking
place in the brain. "This act of thinking gives rise to different
displacements of the subtile nervous fluid and to different
accumulations of this fluid in the parts of the brain where the ideas
have been traced." There result from the flow of the fluid on the
conserved impressions of ideas, special movements which portions of this
fluid acquire with each impression, which give rise to compounds by
their union producing new impressions on the delicate organ which
receives them, and which constitute abstract ideas of all kinds, also
the different acts of thought.

All the acts which constitute thought are the comparisons of ideas, both
simple and complex, and the results of these comparisons are judgments.

He then discusses the influence of the nervous fluid on the muscles, and
also its influence considered as the cause of feeling (_sentiment_).
Finally he concludes that _feu fixe_, caloric, the nervous fluid, and
the electric fluid "are only one and the same substance occurring in
different states."


FOOTNOTES:

[107] Charles Bonnet (1720-1793), a Swiss naturalist, is famous for his
work on Aphides and their parthenogenetic generation, on the mode of
reproduction in the Polyzoa, and on the respiration of insects. After
the age of thirty-four, when his eyesight became impaired, he began his
premature speculations, which did not add to his reputation. Judging,
however, by an extract from his writings by D'Archiac (_Introduction a
l'Etude de la Paleontologie stratigraphique_, ii., p. 49), he had sound
ideas on the theory of descent, claiming that "la diversite et la
multitude des conjunctions, peut-etre meme la diversite des climats et
des nourritures, ont donne naissance a de nouvelles especes ou a des
individus intermediaires" (_Oeuvres d'Hist. nat. et de Philosophie_,
in-8vo, p. 230, 1779).

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