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caloric by Lavoisier and Laplace; the first true conceptions of the

source of fire and heat; the experiments; laws; and means by which

Dufay; Nollet; Franklin; and especially Coulomb explain; manipulate

and; for the first time; utilize electricity。  …  In Chemistry; all

the foundations of the science: isolated oxygen; nitrogen and

hydrogen; the composition of water; the theory of combustion; chemical

nomenclature; quantitative analysis; the indestructibility of matter;

in short; the discoveries of Scheele; Priestley; Cavendish and Stahl;

crowned with the clear and concise theory of Lavoisier。  …   In

Mineralogy; the goniometer; the constancy of angles and the primary

laws of derivation by Romé de Lisle; and next the discovery of types

and the mathematical deduction of secondary forms by Haüy。  …  In

Geology; the verification and results of Newton's theory; the exact

form of the earth; the depression of the poles; the expansion of the

equator;'3' the cause and the law of the tides; the primitive fluidity

of the planet; the constancy of its internal heat; and then; with

Buffon; Desmarets; Hutton and Werner; the aqueous or igneous origin of

rocks; the stratifications of the earth; the structure of beds of

fossils; the prolonged and repeated submersion of continents; the slow

growth of animal and vegetable deposits; the vast antiquity of life;

the stripping; fracturing and gradual transformation of the

terrestrial surface;'4' and; finally the grand picture in which Buffon

describes in approximate manner the entire history of our globe; from

the moment it formed a mass of glowing lava down to the time when our

species; after so many lost or surviving species; was able to inhabit

it。  …  Upon this science of inorganic matter we see arising at the

same time the science of organic matter。  Grew; and then Vaillant had

just demonstrated the sexual system and described the fecundating of

plants; Linnaeus invents botanical nomenclature and the first complete

classifications; the Jussieus discover the subordination of

characteristics and natural classification。  Digestion is explained by

Réaumur and Spallanzani; respiration by Lavoisier ; Prochaska verifies

the mechanism of reflex actions ; Haller and Spallanzani experiment on

and describe the conditions and phases of generation。  Scientists

penetrate to the lowest stages of animal life。  Réaumur publishes his

admirable observations on insects and Lyonnet devotes twenty years to

portraying the willow…caterpillar; Spallanzani resuscitates his

rotifers; Tremblay dissects his fresh…water polyps; and Needham

reveals his infusoria。  The experimental conception of life is deduced

from these various researches。  Buffon already; and especially Lamarck;

in their great and incomplete sketches; outline with penetrating

divination the leading features of modern physiology and zoology。

Organic molecules everywhere diffused or everywhere growing; species

of globules constantly in course of decay and restoration; which;

through the blind and spontaneous development; transform themselves;

multiply and combine; and which; without either foreign direction or

any preconceived end; solely through the effect of their structure and

surroundings; unite together to form those masterly organisms which we

call plants and animals : in the beginning; the simplest forms; and

next a slow; gradual; complex and perfected organization ; the organ

created through habits; necessity and surrounding medium; heredity

transmitting acquired modifications;'5' all denoting in advance; in a

state of conjecture and approximation; the cellular theory of later

physiologists'6' and the conclusions of Darwin。'7' In the picture

which the human mind draws of nature; the general outline is marked by

the science of the eighteenth century; the arrangement of its plan and

of the principal masses being so correctly marked; that to day the

leading lines remain intact。  With the exception of a few partial

corrections we have nothing to efface。



This vast supply of positive or probable facts; either demonstrated

or anticipated; furnishes food; substance and impulse to the intellect

of the eighteenth century。  Consider the leaders of public opinion; the

promoters of the new philosophy: they are all; in various degrees;

versed in the physical and natural sciences。  Not only are they

familiar with theories and authorities; but again they have a personal

knowledge of facts and things。  Voltaire'8' is among the first to

explain the optical and astronomical theories of Newton; and again to

make calculations; observations and experiments of his own。  He writes

memoirs for the Academy of Sciences 〃On the Measure of Motive Forces;〃

and 〃On the Nature and Diffusion of Heat。〃 He handles Réamur's

thermometer; Newton's prism; and Muschenbrock's pyrometer。  In his

laboratory at Cirey he has all the known apparatus for physics and

chemistry。  He experiments with his own hand on the reflection of light

in space; on the increase of weight in calcified metals; on the

renewal of amputated parts of animals; and in the spirit of a true

savant; persistently; with constant repetitions; even to the beheading

of forty snails and slugs; to verify an assertion made by Spallanzani。

…  The same curiosity and the same preparation prevails with all

imbued with the same spirit。  In the other camp; among the Cartesians;

about to disappear; Fontenelle is an excellent mathematician; the

competent biographer of all eminent men of science; the official

secretary and true representative of the Academy of Sciences。  In other

places; in the Academy of Bordeaux; Montesquieu reads discourses on

the mechanism of the echo; and on the use of the renal glands; he

dissects frogs; tests the effect of heat and cold on animated tissues;

and publishes observations on plants and insects。  …  Rousseau; the

least instructed of all; attends the lectures of the chemist Rouelle;

botanizing and appropriating to himself all the elements of human

knowledge with which to write his 〃Emile。〃  …  Diderot taught

mathematics and devoured every science and art even to the technical

processes of all industries。  D'Alembert stands in the first rank of

mathematicians。  Buffon translated Newton's theory of flux; and the

Vegetable Statics of Hales; he is in turn a metallurgist; optician;

geographer; geologist and; last of all; an anatomist。  Condillac; to

explain the use of signs and the relation of ideas; writes abridgments

of arithmetic; algebra; mechanics and astronomy。'9' Maupertuis;

Condorcet and Lalande are mathematicians; physicists and astronomers;

d'Holbach; Lamettrie and Cabanis are chemists; naturalists

physiologists and physicians。  …  Prophets of a superior or inferior

kind; masters or pupils; specialists or simple amateurs; all draw

directly or indirectly from the living source that has just burst

forth。  This is their basis when they begin to teach about Man; what he

is; from whence he came; where he is going; what he may become and

what he should be。  A new point of departure leads to new points of

view; so that the idea; which was then entertained of the human being

will become completely transformed。



II。   SCIENCE DETACHED FROM THEOLOGY。



Change of the point of view in the science of man。  … It is detached

from theology and is united with the natural sciences。



Let us suppose a mind thoroughly imbued with these new truths; to

be placed on the orbit of Saturn; and let him observe'10'。  Amidst this

vast and overwhelming space and in these boundless solar

archipelagoes; how small is our own sphere; and the earth; what a

grain of sand! What multitudes of worlds beyond our own; and; if life

exists in them; what combinations are possible other than those of

which we are the result! What is life; what is organic substance in

the monstrous universe but an indifferent mass; a passing accident;

the corruption of a few epidermic particles? And if this be

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