My own belief is, that what Lankester calls the 'pure Darwinians' are doing the same thing in another direction. By endeavouring, with Wallace and Weismann, to make natural selection all in all as the sole cause of adaptive structure, and expressly discarding the Darwinian recognition of use and disuse. I think they are doing harm to natural selection theory itself. Moreover, because I do not see any sufficient reason as yet to budge from the real Darwinian standpoint (Weismann has added nothing to the facts which were known to Charles Darwin), the post-Darwinians accuse me of moving away from Darwinian principles. But it is they who are moving, and, because they see a change in our relative positions, affirm that it is I. In point of fact, my position has never varied in the least, and my confession of faith would still follow, in every detail, that given on p. 421 of 'Origin,' 6th ed., which, it seems to me, might also be regarded as prophetic no less than retrospective. If I did not say all this in my paper in physiological selection, it is only because I never conceived the possibility of my being accused of trying to undermine natural selection; and, therefore, I only stated as briefly as possible what my relations were to it. Yet it seems to me that this statement was clear enough if Wallace had not come down with his preposterous 'Romanes _versus_ Darwin.' At all events, it is not in my power--or, I believe, in that of anybody else--to express more strongly than I now have in 'Nature,' in answer to Dyer, what I do hold about natural selection in its relation to physiological selection, sexual selection, and other subordinate principles. Of course, if there were a debate on these lines at the B.A., I should get my part of it published somewhere. As far as I can honestly see, my 'position' is absolutely identical with that in last editions of 'Origin' and 'Descent,' with, perhaps, a 'tendency' to lay more stress on levelling influence of Panmixia. _Re_ physiological selection. I have sent Correvon, of Geneva, £50 to help in founding a garden in the Alps, which will have the proud distinction of being the highest garden in the world. He is a splendid man for his knowledge of Alpine flora, and besides, is strongly bitten with a desire to test physiological selection. Of course I shall do the hybridising experiments myself, but he will collect the material from the different mountains--_i.e._ nearly allied species, topographically separated, and therefore, I hope, mutually fertile. The converse experiments of nearly allied species on common areas may be tried in England.