Читать книгу The Atlantic Monthly, Volume 18, No. 108, October, 1866 - Various - Страница 5
THE DARWINIAN THEORY
ОглавлениеGreat interest has been awakened, of late, by the promulgation of a new "Theory of Creation"; and non-scientific readers have met with numerous controversial articles in the journals, magazines, and newspapers of the day. The name of Darwin, after having been honorably known for a quarter of a century to the scientists of the world, has become familiar to us all as that of the author of this new theory. A word has been added to our vocabulary. "Darwinian" is now a distinctive epithet wherewith to individualize the new school of thought, and an appellation to designate its votaries. Notwithstanding the interest which Mr. Darwin's writings and the replies of his opponents have created, and the constant allusion to them in publications of all kinds; in spite of the active warfare they have incited; in spite of the sneers and sarcasms which have been launched by writers, lecturers, and preachers,—sure means of advertisement among the people,—few really and thoroughly comprehend Mr. Darwin's idea. A lecturer, alluding to it lately, says that it will be worthy of consideration when we see an ape turn into a man; and this is about the extent, we imagine, to which the great mass of people understand a theory which has been received as revelation by many of the first scientific men of the age,—men who have given their lives to patient, profound, untiring, unimpassioned study of nature, and who rank among the foremost thinkers of the world.
Leaving the argumentative detail to those whose learning is the only armory which can supply weapons adequate to the maintenance of the struggle, let us see if we cannot explain the idea which causes it; nor consider its verification to lie in the metamorphosis of an ape into a man.
Darwin's idea is generally conceived to be a new one. This is not strictly the case. The real foundation was laid long ago. It is the law of persistent force, acting on the universe. This is as old as Buddha, and was a dogma of Buddhism. It has been enunciated in some form or other for ages. But Darwin has infused into it a new vital strength, has given it new application, has clearly explained its workings, has been its prophet to the people. To fully understand the history and progress of the Darwinian theory, we must look back many years, and trace the influence which theology has had upon the advance of scientific knowledge.
For centuries the Bible was understood to contain a perfect, exact, undoubted account of the origin of the world. It was believed by everybody that the world was made in six days. The very imperfect acquaintance which the ancients had with geology and physics allowed them to accept this relation unchallenged. Faith was far stronger than reason; and, during the long ages in which the Church ruled supreme, this statement was accepted and implicitly believed by the whole race of Christians. But as men began to grow more enlightened,—as, one by one, the secrets of nature were revealed to the students whose desire for knowledge overbore their tacit acceptance of tradition,—doubts began to arise as to the possibility of the truth of this long-cherished idea. When the printing-press came, and enabled these ardent explorers to communicate freely the results of their studious labors, the leaven of discredit, thus disseminated, began to work in the mass, and the reason of men began to rise beneath the superincumbent theological pressure which had so long weighed upon it. The multitude of facts gathered together by these careful students became, by and by, so vast, and the conclusions to which they led so indubitable, that the theologians were forced, out of simple common-sense, to revise their expoundings of the sacred writings.
When it was found that the earth was made up of vast depositions of matter which contained the remains of long-extinct creatures, whose fragments were buried in solid rocks, once soft, oozy mud; when it was found that other rocks, hundreds of feet in thickness, were wholly composed of the imperishable remains of other extinct animals, which once lived and died and were gathered together in waters which broke over the very spot where these rocks now rise; when it was found that untold millions of years were necessary for the formation of one single group of these rocks, among many equally vast; when it was found that, in the memory of man, during the lapse of at least five thousand years, the earth had undergone no appreciable change; when it was found that the earth was the result of the action of laws existent in matter,—an upheaving, a washing away, a hardening, a disintegrating through a period of time beyond the conception of man,—the theologians were forced to substitute periods for days. When the old walls which had circumscribed man's mind became so crumbled as to allow of egress, individuals broke through them and revelled in the freedom of intelligent thought. When these walls were demolished by those who had themselves erected them, they were leaped, in all directions, by ardent explorers; and naturalists, no longer restrained by tradition, rushed upon voyages of discovery into the teeming world before them.
For a while this emancipation exhausted itself in the contemplation of the physical world, and an inquiry into brute life. Speculations and theories might riot in a past which was a practical eternity. They had unlimited space wherein to project, backward, the structure of the universe. But this long-stretching past was to be peopled only by the lower orders of animal life. The rocks were found to be filled with stony remains of animals who perished when the sandstone, which built old crumbling castles, was sea-shore mud; the chalk hills which bore them were found to be made up of myriads of little creatures. These humble representatives of life might be, must be, credited with a remote antiquity. But man was not an animal. He was a being apart. Although he was liable to heat and cold, disease and death, although his body was made of the same materials as the brute's, and was subject to the same laws of life, he was invested with an individuality which separated him from them. For a while the old influence of theological rule held even these venturous explorers to the ancient landmarks of human origin. By and by, the same impulse which had before led men to examine the proofs of physical creation induced them to consider the evidence of their own advent upon earth. Certain Scriptural statements did not appear reconcilable with each other. Cain went forth and builded a city; and there were artificers in brass and iron. Now Cain was only one of two men when he went forth. Whence came the citizens of that early settlement, and how did they understand the production of brass, a composite metal? How was it that man always met man wherever he went on the globe? Five thousand years ago the varied races were known to be distinct as now, and yet man was formerly said to be but about six thousand years old. Could one thousand years have produced the changes then evident, while five thousand succeeding years have scarce altered these different races? These and many other difficulties led thinkers to question whether man might not look much farther back into the past for his origin, and whether the same laws which had governed the birth, continuance, and distribution of other animals were not always in action to produce in him kindred results. The old belief, that all men descended from one man, began to be shaken; and good, honest, faithful Christians expressed their doubts of the matter. It was surmised that they were created in numbers. The old idea, that animals were all created in individual pairs, was found to be incompatible with the discovery of animal remains, in profusion, in rocks which were mud ages before any Adam could have existed to give them Hebrew names. Then, breaking away from the theological bonds, there sprang into active thought men of far-reaching minds, who began a thorough reconstruction of the whole theory of creation. The handwriting on the wall was Natural Law. All creation, man included, was but the result of one undeviating, unceasing, eternal, all-pervading law, and the state of the universe at any given moment was the state of evolution which that universe exhibited. Behind this law was the great inscrutable Spirit-power.
The infinite number of varied, aggregated facts stored up by man's patient study of this universe are irrelevant here, in a sketch of the progressive advance of his knowledge of creation. Those who desire to examine the evidence which has led to this verdict must go over the records themselves, or accept, out of their own convictions, the result of the examination. To entirely comprehend the Darwinian idea, one should be, to a certain extent, familiar with the principles of science. In other words, he should know more or less of what Darwin knows. He should be familiar with the general results of man's study in the different branches of science. He need not be an astronomer, a physicist, a geologist, a zoölogist, a botanist; but he should have a general acquaintance with the results of the labors of those who are such. He should, to a certain extent, understand the workings of Natural Law.
This is the great battle-ground on which the struggle is now taking place. The point at issue is, whether the physical changes of the material world, the introduction, continuance, and variation of organized beings, are due to the direct, special intervention of Deity, or whether they are the results of primeval laws, inherent in matter, and out of whose workings spring the phenomena of nature. The adherents to the former opinion maintain that the Deity has created all animals individually, or in individual species, by direct action, apart from natural forces, and indeed by an interference therewith. The votaries of the latter deny special creation, and maintain that all animals are, like the rest of the universe, the results of forces acting through all time, producing, by their diverse changing influences, the variations which, as they have widened and strengthened, have resulted in the difference exhibited among animals. The first is the old traditional idea, having its foundation in belief, and drawing its support from the Scriptures. The last is the modern conviction, having its foundation in reason, and drawing its support from the study of nature. How are these differences among animate creatures—these wide contrasts of form, size, and habits—produced, if not by God's special creation? This is the question which Mr. Darwin and his school of thinkers are seeking to answer.
Some half a century ago, M. Lamarck, a French naturalist, propounded a theory which excited the derision of the whole world. He accounted for these variations by suggesting that, as any special want was felt by an animal, the body took on that structure which was required to relieve it. To give a broad illustration: if men needed to fly for the support of life, wings would gradually grow out from their shoulders. Ridiculous as this may be, it showed that thinkers were at that time endeavoring to account, on purely natural grounds, for what they considered natural, and not supernatural phenomena.
Some twenty years ago, a book made its appearance which startled the whole reading world, and caused as much dispute as Darwin has since done. This was "Vestiges of the Natural History of Creation." It was anonymous, and the author has never acknowledged it: to this day he is unknown. This book was learned and lucid. It was received with delight by those who were still looking for some explanation of animal origin on natural grounds; and was derided quite as much as Lamarck's work by the adherents to the old traditional belief. Scouted by the great majority of naturalists, who still clung with tenacity to the notions of their predecessors, stigmatized as atheistic and abominable by theologians, it was first read with eagerness, and then put aside; and though it went through many editions, it is now almost forgotten. But this book was the beginning of Darwinism. It says:—
"We have seen powerful evidence that the construction of this globe and its associates, and, inferentially, that of all the other globes in space, was the result, not of any immediate or personal exertion on the part of Deity, but of natural laws which are expressions of his will. What is to hinder our supposing that the organic creation is also the result of natural laws, which are in like manner an expression of his will?"
Referring to the Deity as the great motive-power of all the universe, the author says:—
"To a reasonable mind the Divine attributes must appear, not diminished or reduced in any way, by supposing a creation by law, but infinitely exalted. It is the narrowest of all views of the Deity, and characteristic of a humble class of intellects, to suppose him acting constantly in particular ways for particular occasions. It, for one thing, greatly detracts from his foresight,—the most undeniable of all the attributes of Omnipotence. It lowers him towards the level of our own humble intellects. Much more worthy of him it surely is to suppose that all things have been commissioned by him from the first, though neither is he absent from a particle of the current of natural affairs in one sense, seeing that the whole system is continually supported by his providence.... When all is seen to be the result of law, the idea of an Almighty author becomes irresistible, for the creation of a law for an endless series of phenomena—an act of intelligence above all else we can conceive—could have no other imaginable source, and tells, moreover, as powerfully for a sustaining as for an originating power."
He sums up the hypothesis which he seeks to sustain thus:—
"I suggest, then, as an hypothesis already countenanced by much that is ascertained, and likely to be further sanctioned by much that remains to be known, that the first step was an advance, under favor of peculiar circumstances, from the simplest forms of being to the next more complicated, and this through the medium, of the ordinary process of generation."
And further:—
"That the simplest and most primitive type, under a law to which that of like production is subordinate, gave birth to the type next above it; that this again produced the next higher, and so on to the very highest