ESSAYS ON EVOLUTION : 303 
micry proper is between different living creatures, usually 
caer insects—butterflies and moths. As expounded by 
Bates, author of The Naturalist on the Amazons, its originator, the 
theory of Mimicry was that some butterflies being found tooth- 
thers bei 
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nauseous, and so left alone, the former had gradually, under the 
operation _ Natural Selection, assumed the likeness of the latter, 
and so shared their immunity. Further observation has, how 
ever, sobualed a great Scant sabes in the fact that not unfrequently 
nauseous species mimic one another, and to meet this Miiller 
introduced the further explanation that such display of “ warning 
colours”’ on a large set conduces to the more speedy education 
r ‘ia ; ? ; 
culties. The Batesian theory postulates that the mimicked s 
should be far more numerous in any region than their i er 
eee is not always the case, and, which is still more curious, 
me of the unpalatable “ mortels,”’ as Heliconide, actually mimic 
staat palatable imitators, as Pieride. Another circumstance not 
asy of explanation is that a is often confined to one sex, 
ye a oe not always the fem 
he Miillerian theory veel with difficulty, be made to fit 
in with ‘tia and other phenomena, and Professor Poulton would 
cry), o Pecdpienae [Aboreaetie ‘Mier ry and Alluring 
Coloration). 
ow all this complex colour-scheme works out in theory, 
readers must be left to learn from Professor Poulton himself, but 
E tone to ways 0 
intricate a labyrinth, and whether there may not more probably 
be some law yet undiscovered by scie 8 which would afford a far 
at there 7s a law governing t the 1 bewildering phenomena of 
Mimicry there can be little doubt ; that they can all be explained, 
as our author believes, by Natural Selection alone, seems to us, at 
least, quite inconceivable. 
a. a. 
WE regret to record the death of Mr. Arthur Lister, F.R.S., 
which took place at Lyme oe on July 19. We hope to publish 
a fuller notice in an early issue 
