The Immense Journey Page 6

  If one could run the story of that first human group like a speeded-up motion picture through a million years of time, one might see the stone in the hand change to the flint ax and the torch. All that swarming grassland world with its giant bison and trumpeting mammoths would go down in ruin to feed the insatiable and growing numbers of a carnivore who, like the great cats before him, was taking his energy indirectly from the grass. Later he found fire and it altered the tough meats and drained their energy even faster into a stomach ill adapted for the ferocious turn man’s habits had taken.

  His limbs grew longer, he strode more purposefully over the grass. The stolen energy that would take man across the continents would fail him at last. The great Ice Age herds were destined to vanish. When they did so, another hand like the hand that grasped the stone by the river long ago would pluck a handful of grass seed and hold it contemplatively.

  In that moment, the golden towers of man, his swarming millions, his turning wheels, the vast learning of his packed libraries, would glimmer dimly there in the ancestor of wheat, a few seeds held in a muddy hand. Without the gift of flowers and the infinite diversity of their fruits, man and bird, if they had continued to exist at all, would be today unrecognizable. Archaeopteryx, the lizard-bird, might still be snapping at beetles on a sequoia limb; man might still be a nocturnal insectivore gnawing a roach in the dark. The weight of a petal has changed the face of the world and made it ours.

  THE REAL SECRET OF PILTDOWN

  How did man get his brain? Many years ago Charles Darwin’s great contemporary, and co-discoverer with him of the principle of natural selection, Alfred Russel Wallace, propounded that simple question. It is a question which has bothered evolutionists ever since, and when Darwin received his copy of an article Wallace had written on this subject he was obviously shaken. It is recorded that he wrote in anguish across the paper, “No!” and underlined the “No” three times heavily in a rising fervor of objection.

  Today the question asked by Wallace and never satisfactorily answered by Darwin has returned to haunt us. A skull, a supposedly very ancient skull, long used as one of the most powerful pieces of evidence documenting the Darwinian position upon human evolution, has been proven to be a forgery, a hoax perpetrated by an unscrupulous but learned amateur. In the fall of 1953 the famous Piltdown cranium, known in scientific circles all over the world since its discovery in a gravel pit on the Sussex Downs in 1911, was jocularly dismissed by the world’s press as the skull that had “made monkeys out of the anthropologists.” Nobody remembered in 1953 that Wallace, the great evolutionist, had protested to a friend in 1913, “The Piltdown skull does not prove much, if anything!”

  Why had Wallace made that remark? Why, almost alone among the English scientists of his time, had he chosen to regard with a dubious eye a fossil specimen that seemed to substantiate the theory to which he and Darwin had devoted their lives? He did so for one reason: he did not believe what the Piltdown skull appeared to reveal as to the nature of the process by which the human brain had been evolved. He did not believe in a skull which had a modern brain box attached to an apparently primitive face and given, in the original estimates, an antiquity of something over a million years.

  Today we know that the elimination of the Piltdown skull from the growing list of valid human fossils in no way affects the scientific acceptance of the theory of evolution. In fact, only the circumstance that Piltdown had been discovered early, before we had a clear knowledge of the nature of human fossils and the techniques of dating them, made the long survival of this extraordinary hoax possible. Yet in the end it has been the press, absorbed in a piece of clever scientific detection, which has missed the real secret of Piltdown. Darwin saw in the rise of man, with his unique, time-spanning brain, only the undirected play of such natural forces as had created the rest of the living world of plants and animals. Wallace, by contrast, in the case of man, totally abandoned this point of view and turned instead toward a theory of a divinely directed control of the evolutionary process. The issue can be made clear only by a rapid comparison of the views of both men.

  As everyone who has studied evolution knows, Darwin propounded the theory that since the reproductive powers of plants and animals potentially far outpace the available food supply, there is in nature a constant struggle for existence on the part of every living thing. Since animals vary individually, the most cleverly adapted will survive and leave offspring which will inherit, and in their turn enhance, the genetic endowment they have received from their ancestors. Because the struggle for life is incessant, this unceasing process promotes endless slow changes in bodily form, as living creatures are subjected to different natural environments, different enemies, and all the vicissitudes against which life has struggled down the ages.

  Darwin, however, laid just one stricture on his theory: it could, he maintained, “render each organized being only as perfect or a little more perfect than other inhabitants of the same country.” It could allow any animal only a relative superiority, never an absolute perfection—otherwise selection and the struggle for existence would cease to operate. To explain the rise of man through the slow, incremental gains of natural selection, Darwin had to assume a long struggle of man with man and tribe with tribe.

  He had to make this assumption because man had far outpaced his animal associates. Since Darwin’s theory of the evolutionary process is based upon the practical value of all physical and mental characters in the life struggle, to ignore the human struggle of man with man would have left no explanation as to how humanity by natural selection alone managed to attain an intellectual status so far beyond that of any of the animals with which it had begun its competition for survival.

  To most of the thinkers of Darwin’s day this seemed a reasonable explanation. It was a time of colonial expansion and ruthless business competition. Peoples of primitive cultures, small societies lost on the world’s margins, seemed destined to be destroyed. It was thought that Victorian civilization was the apex of human achievement and that other races with different customs and ways of life must be biologically inferior to Western man. Some of them were even described as only slightly superior to apes. The Darwinians, in a time when there were no satisfactory fossils by which to demonstrate human evolution, were unconsciously minimizing the abyss which yawned between man and ape. In their anxiety to demonstrate our lowly origins they were throwing modern natives into the gap as representing living “missing links” in the chain of human ascent.

  It was just at this time that Wallace lifted a voice of lonely protest. The episode is a strange one in the history of science, for Wallace had, independently of Darwin, originally arrived at the same general conclusion as to the nature of the evolutionary process. Nevertheless, only a few years after the publication of Darwin’s work, The Origin of Species, Wallace had come to entertain a point of view which astounded and troubled Darwin. Wallace, who had had years of experience with natives of the tropical archipelagoes, abandoned the idea that they were of mentally inferior cast. He did more. He committed the Darwinian heresy of maintaining that their mental powers were far in excess of what they really needed to carry on the simple food-gathering techniques by which they survived.

  “How, then,” Wallace insisted, “was an organ developed so far beyond the needs of its possessor? Natural selection could only have endowed the savage with a brain a little superior to that of an ape, whereas he actually possesses one but little inferior to that of the average member of our learned societies.”

  At a time when many primitive peoples were erroneously assumed to speak only in grunts or to chatter like monkeys, Wallace maintained his view of the high intellectual powers of natives by insisting that “the capacity of uttering a variety of distinct articulate sounds and of applying to them an almost infinite amount of modulation … is not in any way inferior to that of the higher races. An instrument has been developed in advance of the needs of its possessor.”

  Finally, Wallace
challenged the whole Darwinian position on man by insisting that artistic, mathematical, and musical abilities could not be explained on the basis of natural selection and the struggle for existence. Something else, he contended, some unknown spiritual element, must have been at work in the elaboration of the human brain. Why else would men of simple cultures possess the same basic intellectual powers which the Darwinists maintained could be elaborated only by competitive struggle?

  “If you had not told me you had made these remarks,” Darwin said, “I should have thought they had been added by someone else. I differ grievously from you and am very sorry for it.” He did not, however, supply a valid answer to Wallace’s queries. Outside of murmuring about the inherited effects of habit—a contention without scientific validity today—Darwin clung to his original position. Slowly Wallace’s challenge was forgotten and a great complacency settled down upon the scientific world.

  For seventy years after the publication of The Origin of Species in 1859, there were only two finds of fossil human skulls which seemed to throw any light upon the Darwin-Wallace controversy. One was the discovery of the small-brained Java Ape Man, the other was the famous Piltdown or “dawn man.” Both were originally dated as lying at the very beginning of the Ice Age, and, though these dates were later to be modified, the skulls, for a very long time, were regarded as roughly contemporaneous and very old.

  Two more unlike “missing links” could hardly be imagined. Though they were supposed to share a million-year antiquity, the one was indeed quite primitive and small-brained; the other, Piltdown, in spite of what seemed a primitive lower face, was surprisingly modern in brain. Which of these forms told the true story of human development? Was a large brain old? Had ages upon ages of slow, incremental, Darwinian increase produced it? The Piltdown skull seemed to suggest such a development.

  Many were flattered to find their anthropoid ancestry seemingly removed to an increasingly remote past. If one looked at the Java Ape Man, one was forced to contemplate an ancestor, not terribly remote in time, who still had a face and a brain which hinted strongly of the ape. Yet, when by geological evidence this “erect walking ape-man” was finally assigned to a middle Ice Age antiquity, there arose the immediate possibility that Wallace could be right in his suspicion that the human brain might have had a surprisingly rapid development. By contrast, the Piltdown remains seemed to suggest a far more ancient and slow-paced evolution of man. The Piltdown hoaxer, in attaching an ape jaw to a human skull fragment, had, perhaps unwittingly, created a creature which supported the Darwinian idea of man, not too unlike the man of today, extending far back into pre-Ice Age times.

  Which story was the right one? Until the exposé of Piltdown in 1953, both theories had to be considered possible and the two hopelessly unlike fossils had to be solemnly weighed in the same balance. Today Piltdown is gone. In its place we are confronted with the blunt statement of two modern scientists, M. R. A. Chance and A. P. Mead.

  “No adequate explanation,” they confess over eighty years after Darwin scrawled his vigorous “No!” upon Wallace’s paper, “has been put forward to account for so large a cerebrum as that found in man.”1

  We have been so busy tracing the tangible aspects of evolution in the forms of animals that our heads, the little globes which hold the midnight sky and the shining, invisible universes of thought, have been taken about as much for granted as the growth of a yellow pumpkin in the fall.

  Now a part of this mystery as it is seen by the anthropologists of today lies in the relation of the brain to time. “If,” Wallace had said, “researches in all parts of Europe and Asia fail to bring to light any proofs of man’s presence far back in the Age of Mammals, it will be at least a presumption that he came into existence at a much later date and by a more rapid process of development.” If human evolution should prove to be comparatively rapid, “explosive” in other words, Wallace felt that his position would be vindicated, because such a rapid development of the brain would, he thought, imply a divinely directed force at work in man. In the 1870’s when he wrote, however, human prehistory was largely an unknown blank. Today we can make a partial answer to Wallace’s question. Since the exposure of the Piltdown hoax all of the evidence at our command—and it is considerable—points to man, in his present form, as being one of the youngest and newest of all earth’s swarming inhabitants.

  The Ice Age extends behind us in time for, at most, a million years. Though this may seem long to one who confines his studies to the written history of man, it is, in reality, a very short period as the student of evolution measures time. It is a period marked more by the extinction of some of the last huge land animals, like the hairy mammoth and the saber-toothed tiger, than it is by the appearance of new forms of life. To this there is only one apparent exception: the rise and spread of man over the Old World land mass.

  Most of our knowledge of him—even in his massive-faced, beetle-browed stage—is now confined, since the loss of Piltdown, to the last half of the Ice Age. If we pass backward beyond this point we can find traces of crude tools, stone implements which hint that some earlier form of man was present here and there in Europe, Asia, and particularly Africa in the earlier half of Ice Age time, but to the scientist it is like peering into the mists floating over an unknown landscape. Here and there through the swirling vapor one catches a glimpse of a shambling figure, or a half-wild primordial face stares back at one from some momentary opening in the fog. Then, just as one grasps at a clue, the long gray twilight settles in and the wraiths and the half-heard voices pass away.

  Nevertheless, particularly in Africa, a remarkable group of human-like apes have been discovered: creatures with small brains and teeth of a remarkably human cast. Prominent scientists are still debating whether they are on the direct line of ascent to man or are merely near relatives of ours. Some, it is now obvious, existed too late in time to be our true ancestors, though this does not mean that their bodily characters may not tell us what the earliest anthropoids who took the human turn of the road were like.

  These apes are not all similar in type or appearance. They are men and yet not men. Some are frailer-bodied, some have great, bone-cracking jaws and massive gorilloid crests atop their skulls. This fact leads us to another of Wallace’s remarkable perceptions of long ago. With the rise of the truly human brain, Wallace saw that man had transferred to his machines and tools many of the alterations of parts that in animals take place through evolution of the body. Unwittingly, man had assigned to his machines the selective evolution which in the animal changes the nature of its bodily structure through the ages. Man of today, the atomic manipulator, the aeronaut who flies faster than sound, has precisely the same brain and body as his ancestors of twenty thousand years ago who painted the last Ice Age mammoths on the walls of caves in France.

  To put it another way, it is man’s ideas that have evolved and changed the world about him. Now, confronted by the lethal radiations of open space and the fantastic speeds of his machines, he has to invent new electronic controls that operate faster than his nerves, and he must shield his naked body against atomic radiation by the use of protective metals. Already he is physically antique in this robot world he has created. All that sustains him is that small globe of gray matter through which spin his ever-changing conceptions of the universe.

  Yet, as Wallace, almost a hundred years ago, glimpsed this timeless element in man, he uttered one more prophecy. When we come to trace out history into the past, he contended, sooner or later we will come to a time when the body of man begins to differ and diverge more extravagantly in its appearance. Then, he wrote, we shall know that we stand close to the starting point of the human family. In the twilight before the dawn of the human mind, man will not have been able to protect his body from change and his remains will bear the marks of all the forces that play upon the rest of life. He will be different in his form. He will be, in other words, as variable in body as we know the South African man-apes to be.
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  Today, with the solution of the Piltdown enigma, we must settle the question of the time involved in human evolution in favor of Wallace, not Darwin; we need not, however, pursue the mystical aspects of Wallace’s thought—since other factors yet to be examined may well account for the rise of man. The rapid fading out of archaeological evidence of tools in lower Ice Age times—along with the discovery of man-apes of human aspect but with ape-sized brains, yet possessing a diverse array of bodily characters—suggests that the evolution of the human brain was far more rapid than that conceived of in early Darwinian circles. At that time it was possible to hear the Eskimos spoken of as possible survivals of Miocene men of several million years ago. By contrast to this point of view, man and his rise now appear short in time—explosively short There is every reason to believe that whatever the nature of the forces involved in the production of the human brain, a long slow competition of human group with human group or race with race would not have resulted in such similar mental potentialities among all peoples everywhere. Something—some other factor—has escaped our scientific attention.

  There are certain strange bodily characters which mark man as being more than the product of a dog-eat-dog competition with his fellows. He possesses a peculiar larval nakedness, difficult to explain on survival principles; his periods of helpless infancy and childhood are prolonged; he has aesthetic impulses which, though they vary in intensity from individual to individual, appear in varying manifestations among all peoples. He is totally dependent, in the achievement of human status, upon the careful training he receives in human society.

  Unlike a solitary species of animal, he cannot develop alone. He has suffered a major loss of precise instinctive controls of behavior. To make up for this biological lack, society and parents condition the infant, supply his motivations, and promote his long-drawn training at the difficult task of becoming a normal human being. Even today some individuals fail to make this adjustment and have to be excluded from society.