"By great good luck there is an excellent library here, with a good copy of Suarez,[255] in a dozen big folios. Among these I dived, to the great astonishment of the librarian, and looking into them 'as careful robins eye the delver's toil' (vide Idylls), I carried off the two venerable clasped volumes which were most promising." Even those who know Mr. Huxley's unrivalled power of tearing the heart out of a book must marvel at the skill with which he has made Suarez speak on his side. "So I have come out," he wrote, "in the new character of a defender of Catholic orthodoxy, and upset Mivart out of the mouth of his own prophet."
The remainder of Mr. Huxley's critique is largely occupied with a dissection of the Quarterly reviewer's psychology, and his ethical views. He deals, too, with Mr. Wallace's objections to the doctrine of Evolution by natural causes when applied to the mental faculties of Man. Finally, he devotes a couple of pages to justifying his description of the Quarterly reviewer's treatment of Mr. Darwin as alike "unjust and unbecoming."[256]
In the sixth edition my father also referred to the "direct action of the conditions of life" as a subordinate cause of modification in living things: On this subject he wrote to Dr. Moritz Wagner (Oct. 13, 1876): "In my opinion the greatest error which I have committed, has been not allowing sufficient weight to the direct action of the environment, i.e. food, climate, &c., independently of natural selection. Modifications thus caused, which are neither of advantage nor disadvantage to the modified organism, would be especially favoured, as I can now see chiefly through your observations, by isolation, in a small area, where only a few individuals lived under nearly uniform conditions."
It has been supposed that such statements indicate a serious change of front on my father's part. As a matter of fact the first edition of the Origin contains the words, "I am convinced that natural selection has been the main but not the exclusive means of modification." Moreover, any alteration that his views may have undergone was due not to a change of opinion, but to change in the materials on which a judgment was to be formed. Thus he wrote to Wagner in the above quoted letter:—
"When I wrote the Origin, and for some years afterwards, I could find little good evidence of the direct action of the environment; now there is a large body of evidence."
With the possibility of such action of the environment he had of course been familiar for many years. Thus he wrote to Mr. Davidson in 1861:—
"My greatest trouble is, not being able to weigh the direct effects of the long-continued action of changed conditions of life without any selection, with the action of selection on mere accidental (so to speak) variability. I oscillate much on this head, but generally return to my belief that the direct action of the conditions of life has not been great. At least this direct action can have played an extremely small part in producing all the numberless and beautiful adaptations in every living creature."
And to Sir Joseph Hooker in the following year:—
"I hardly know why I am a little sorry, but my present work is leading me to believe rather more in the direct action of physical conditions. I presume I regret it, because it lessens the glory of Natural Selection, and is so confoundedly doubtful. Perhaps I shall change again when I get all my facts under one point of view, and a pretty hard job this will be."