Adams must inevitably have begun by asking Sir Isaac for an intelligible reason why the apple fell to the ground. He did not know enough to be satisfied with the fact. The Law of Gravitation was so-and-so, but what was Gravitation? and he would have been thrown quite off his base if Sir Isaac had answered that he did not know.
At the very outset Adams struck on Sir Charles's Glacial Theory or theories.
He was ignorant enough to think that the glacial epoch looked like a chasm between him and a uniformitarian world. If the glacial period were uniformity, what was catastrophe? To him the two or three labored guesses that Sir Charles suggested or borrowed to explain glaciation were proof of nothing, and were quite unsolid as support for so immense a superstructure as geological uniformity. If one were at liberty to be as lax in science as in theology, and to assume unity from the start, one might better say so, as the Church did, and not invite attack by appearing weak in evidence. Naturally a young man, altogether ignorant, could not say this to Sir Charles Lyell or Sir Isaac Newton; but he was forced to state Sir Charles's views, which he thought weak as hypotheses and worthless as proofs. Sir Charles himself seemed shy of them. Adams hinted his heresies in vain. At last he resorted to what he thought the bold experiment of inserting a sentence in the text, intended to provoke correction. "The introduction [by Louis Agassiz] of this new geological agent seemed at first sight inconsistent with Sir Charles's argument, obliging him to allow that causes had in fact existed on the earth capable of producing more violent geological changes than would be possible in our own day." The hint produced no effect. Sir Charles said not a word; he let the paragraph stand; and Adams never knew whether the great Uniformitarian was strict or lax in his uniformitarian creed; but he doubted.
Objections fatal to one mind are futile to another, and as far as concerned the article, the matter ended there, although the glacial epoch remained a misty region in the young man's Darwinism. Had it been the only one, he would not have fretted about it; but uniformity often worked queerly and sometimes did not work as Natural Selection at all. Finding himself at a loss for some single figure to illustrate the Law of Natural Selection, Adams asked Sir Charles for the simplest case of uniformity on record.
Much to his surprise Sir Charles told him that certain forms, like Terebratula, appeared to be identical from the beginning to the end of geological time. Since this was altogether too much uniformity and much too little selection, Adams gave up the attempt to begin at the beginning, and tried starting at the end -- himself. Taking for granted that the vertebrates would serve his purpose, he asked Sir Charles to introduce him to the first vertebrate. Infinitely to his bewilderment, Sir Charles informed him that the first vertebrate was a very respectable fish, among the earliest of all fossils, which had lived, and whose bones were still reposing, under Adams's own favorite Abbey on Wenlock Edge.
By this time, in 1867 Adams had learned to know Shropshire familiarly, and it was the part of his diplomatic education which he loved best. Like Catherine Olney in "Northanger Abbey," he yearned for nothing so keenly as to feel at home in a thirteenth-century Abbey, unless it were to haunt a fifteenth-century Prior's House, and both these joys were his at Wenlock.
With companions or without, he never tired of it. Whether he rode about the Wrekin, or visited all the historical haunts from Ludlow Castle and Stokesay to Boscobel and Uriconium; or followed the Roman road or scratched in the Abbey ruins, all was amusing and carried a flavor of its own like that of the Roman Campagna; but perhaps he liked best to ramble over the Edge on a summer afternoon and look across the Marches to the mountains of Wales. The peculiar flavor of the scenery has something to do with absence of evolution; it was better marked in Egypt: it was felt wherever time-sequences became interchangeable. One's instinct abhors time. As one lay on the slope of the Edge, looking sleepily through the summer haze towards Shrewsbury or Cader Idris or Caer Caradoc or Uriconium, nothing suggested sequence.
The Roman road was twin to the railroad; Uriconium was well worth Shrewsbury;
Wenlock and Buildwas were far superior to Bridgnorth. The shepherds of Caractacus or Offa, or the monks of Buildwas, had they approached where he lay in the grass, would have taken him only for another and tamer variety of Welsh thief. They would have seen little to surprise them in the modern landscape unless it were the steam of a distant railway. One might mix up the terms of time as one liked, or stuff the present anywhere into the past, measuring time by Falstaff's Shrewsbury clock, without violent sense of wrong, as one could do it on the Pacific Ocean; but the triumph of all was to look south along the Edge to the abode of one's earliest ancestor and nearest relative, the ganoid fish, whose name, according to Professor Huxley, was Pteraspis, a cousin of the sturgeon, and whose kingdom, according to Sir Roderick Murchison, was called Siluria. Life began and ended there. Behind that horizon lay only the Cambrian, without vertebrates or any other organism except a few shell-fish. On the further verge of the Cambrian rose the crystalline rocks from which every trace of organic existence had been erased.