That here, on the Wenlock Edge of time, a young American, seeking only frivolous amusement, should find a legitimate parentage as modern as though just caught in the Severn below, astonished him as much as though he had found Darwin himself. In the scale of evolution, one vertebrate was as good as another. For anything he, or any one else, knew, nine hundred and ninety nine parts of evolution out of a thousand lay behind or below the Pteraspis . To an American in search of a father, it mattered nothing whether the father breathed through lungs, or walked on fins, or on feet.
Evolution of mind was altogether another matter and belonged to another science, but whether one traced descent from the shark or the wolf was immaterial even in morals. This matter had been discussed for ages without scientific result. La Fontaine and other fabulists maintained that the wolf, even in morals, stood higher than man; and in view of the late civil war, Adams had doubts of his own on the facts of moral evolution:-- "Tout bien considéré, je te soutiens en somme, Que scélérat pour scélérat, Il vaut mieux être un loup qu'un homme." It might well be! At all events, it did not enter into the problem of Pteraspis, for it was quite certain that no complete proof of Natural Selection had occurred back to the time of Pteraspis, and that before Pteraspis was eternal void. No trace of any vertebrate had been found there; only starfish, shell-fish, polyps, or trilobites whose kindly descendants he had often bathed with, as a child on the shores of Quincy Bay.
That Pteraspis and shark were his cousins, great-uncles, or grandfathers, in no way troubled him, but that either or both of them should be older than evolution itself seemed to him perplexing; nor could he at all simplify the problem by taking the sudden back-somersault into Quincy Bay in search of the fascinating creature he had called a horseshoe, whose huge dome of shell and sharp spur of tail had so alarmed him as a child. In Siluria, he understood, Sir Roderick Murchison called the horseshoe a Limulus, which helped nothing. Neither in the Limulus nor in the Terebratula, nor in the Cestracion Philippi,any more than in the Pteraspis, could one conceive an ancestor, but, if one must, the choice mattered little. Cousinship had limits but no one knew enough to fix them. When the vertebrate vanished in Siluria, it disappeared instantly and forever.
Neither vertebra nor scale nor print reappeared, nor any trace of ascent or descent to a lower type. The vertebrate began in the Ludlow shale, as complete as Adams himself -- in some respects more so -- at the top of the column of organic evolution: and geology offered no sort of proof that he had ever been anything else. Ponder over it as he might, Adams could see nothing in the theory of Sir Charles but pure inference, precisely like the inference of Paley, that, if one found a watch, one inferred a maker. He could detect no more evolution in life since the Pteraspis than he could detect it in architecture since the Abbey. All he could prove was change. Coal-power alone asserted evolution -- of power -- and only by violence could be forced to assert selection of type.
All this seemed trivial to the true Darwinian, and to Sir Charles it was mere defect in the geological record. Sir Charles labored only to heap up the evidences of evolution; to cumulate them till the mass became irresistible.
With that purpose, Adams gladly studied and tried to help Sir Charles, but, behind the lesson of the day, he was conscious that, in geology as in theology, he could prove only Evolution that did not evolve; Uniformity that was not uniform; and Selection that did not select. To other Darwinians -- except Darwin -- Natural Selection seemed a dogma to be put in the place of the Athanasian creed; it was a form of religious hope; a promise of ultimate perfection. Adams wished no better; he warmly sympathized in the object; but when he came to ask himself what he truly thought, he felt that he had no Faith; that whenever the next new hobby should be brought out, he should surely drop off from Darwinism like a monkey from a perch; that the idea of one Form, Law, Order, or Sequence had no more value for him than the idea of none; that what he valued most was Motion, and that what attracted his mind was Change.
Psychology was to him a new study, and a dark corner of education. As he lay on Wenlock Edge, with the sheep nibbling the grass close about him as they or their betters had nibbled the grass -- or whatever there was to nibble -- in the Silurian kingdom of Pteraspis, he seemed to have fallen on an evolution far more wonderful than that of fishes. He did not like it; he could not account for it; and he determined to stop it. Never since the days of his Limulus ancestry had any of his ascendants thought thus. Their modes of thought might be many, but their thought was one.
Out of his millions of millions of ancestors, back to the Cambrian mollusks, every one had probably lived and died in the illusion of Truths which did not amuse him, and which had never changed. Henry Adams was the first in an infinite series to discover and admit to himself that he really did not care whether truth was, or was not, true. He did not even care that it should be proved true, unless the process were new and amusing. He was a Darwinian for fun.
From the beginning of history, this attitude had been branded as criminal -- worse than crime -- sacrilege! Society punished it ferociously and justly, in self-defence. Mr. Adams, the father, looked on it as moral weakness; it annoyed him; but it did not annoy him nearly so much as it annoyed his son, who had no need to learn from Hamlet the fatal effect of the pale cast of thought on enterprises great or small. He had no notion of letting the currents of his action be turned awry by this form of conscience. To him, the current of his time was to be his current, lead where it might.