biting the dewy forest! The false
relation they bear to snails is the most extraordinary thing of the kind
I have ever seen." ("More Letters", I. page 9.)

Many years later, in 1867, he wrote to Fritz Muller suggesting that the
resemblance of a soberly coloured British Planarian to a slug might be
due to mimicry. ("Life and Letters", III. page 71.)

The most interesting copy of Bates's classical memoir on Mimicry
("Contributions to an Insect Fauna of the Amazon Valley". "Trans. Linn.
Soc." Vol. XXIII. 1862, page 495.), read before the Linnean Society in
1861, is that given by him to the man who has done most to support and
extend the theory. My kind friend has given that copy to me; it bears
the inscription:

"Mr A.R. Wallace from his old travelling companion the Author."

Only a year and a half after the publication of the "Origin", we find
that Darwin wrote to Bates on the subject which was to provide such
striking evidence of the truth of Natural Selection: "I am glad to hear
that you have specially attended to 'mimetic' analogies--a most curious
subject; I hope you publish on it. I have for a long time wished to
know whether what Dr Collingwood asserts is true--that the most striking
cases generally occur between insects inhabiting the same country." (The
letter is dated April 4, 1861. "More Letters", I. page 183.)

The next letter, written about six months later, reveals the remarkable
fact that the illustrious naturalist who had anticipated Edward Forbes
in the explanation of arctic forms on alpine heights ("I was forestalled
in only one important point, which my vanity has always made me regret,
namely, the explanation by means of the Glacial period of the presence
of the same species of plants and of some few animals on distant
mountain summits and in the arctic regions. This view pleased me so much
that I wrote it out in extenso, and I believe that it was read by Hooker
some years before E. Forbes published his celebrated memoir on the
subject. In the very few points in which we differed, I still think
that I was in the right. I have never, of course, alluded in print to
my having independently worked out this view." "Autobiography, Life and
Letters", I. page 88.), had also anticipated H.W. Bates in the theory
of Mimicry: "What a capital paper yours will be on mimetic resemblances!
You will make quite a new subject of it. I had thought of such cases
as a difficulty; and once, when corresponding with Dr Coll