pi THE JOURNAL OF BOTANY 
NOTICE OF BOOK. 
Essays on Evolution, 1889-1907. By Epwarp Baayatt Pounrton, 
ope Professor of Zoology in the University of Oxford, &c. 
ae: ahd 479. Oxford: at the Clarendon Press. 1908. 
12s. 
_Prormon Poutton is known as one of the most whole- 
ed cham ions of Darwinism, in the —— sense . the term, 
cess of evolutio n the various papers pide srithaatall which 
a different periods within the dates specified in 
the title, he treats of many topics connected with ag: subject :— 
The Age of the Earth, the real nature of Species, Theories of 
haere and Heredity, the late a Hfusley’ S attionde to- 
at ection ; and, in cial manner, Mimicry and 
tionism of De Vries—in which some are inclined to find a eee 
tute for pure Darwinism. This is one of the ater important 
portions of the book, but without expressing any opinion as to the 
merits of the controversy, we must be allowed to regret the fierce 
polemical, and even personal, tone which his remarks frequently 
assume. Although it has a a admitted that such a style of 
conducting controversy is not confined to one side, it will hardly 
sphere is supposed to infuse; while occasionally it even makes 
th i: iagershe. i clear than ies be desired for the sake of the 
aherat ies 
ee different rch are eoadestty sebkpeeoned under the 
same term, so “Protective Resemblance” and ‘“ Mimicry” 
pr oper so called. Remarkable examples of abe former are 
afforded by the well-known leaf butterflies of the genus Kallima, 
the ae side of whose wing so carefully counterfeits the appear- 
ance of a dead leaf as actually to simulate a hole through its 
as th e were nothing in h 
effect of light shining through a ne conor rent, such as is 
frequently found in fragments of dead leaf, is sometimes to be 
reco; gnized as represented by mace eo reflecting ‘“ body- 
colour,” while the ouilions of the wing — weather-beaten 
a of pti al se and ragged, the | legs of 
