I break my word to add one other particular. Out of 27,000 odd lines in Homer, every one of them expressed, in a sense, heavy weight or force; the blows of heavy-armed men on the breastplates of foes ... [illegible] and the like.--With many thanks, I remain yours very faithfully, W.E. GLADSTONE. P.S.--I should say that the efficacy of lip-expression, undeniably, is most subtle, and defies definite description. * * * * * TO DR. ARCHDALL REID _Parkstone, Dorset. April 19, 1896._ Dear Sir,--I am sorry I had not space to refer more fully to your interesting work.[27] The most important point on which I think your views require emendation is on _instinct_. I see you quote Spalding's experiments, but these have been quite superseded and shown to be seriously incorrect by Prof. Lloyd Morgan. A paper by him in the _Fortnightly Review_ of August, 1893, gives an account of his experiments, and he read a paper on the same subject at the British Association last year. He is now preparing a volume on the subject which will contain the most valuable series of observations yet made on this question. Another point of some importance where I cannot agree with you is your treating dipsomania as a disease, only to be eliminated by drunkenness and its effects. It appears to me to be only a vicious habit or indulgence which would cease to exist in a state of society in which the habit were almost universally reprobated, and the means for its indulgence almost absent. But this is a matter of comparatively small importance.--Believe me yours very truly, ALFRED R. WALLACE. * * * * * TO DR. ARCHDALL REID _Parkstone. April 28, 1896._ Dear Sir,--"We can but reason from the facts we know." We know a good deal of the senses of the higher animals, very little of those of insects. If we find--as I think we do--that all cases of supposed "instinctive knowledge" in the former turn out to be merely intuitive reactions to various kinds of stimulus, combined with very rapidly acquired experience, we shall be justified in thinking that the actions of the latter will some day be similarly explained. When Lloyd Morgan's book is published we shall have much information on this question. (_See_ "Natural Selection and Tropical Nature," pp. 91-7.)--Yours truly, ALFRED R. WALLACE. * * * * * TO PROF. MELDOLA _Parkstone, Dorset. October 12, 1896._