198 The u Species” Wav Reopened. [April, 
this manner, at least two individuals, one of each sex, must 
appear at the same time and place. 
The author more than once seeks to show a close analogy 
between animals and crystals, and to argue from the one to 
the other. But the transmutation of metals, or of crystals 
were it possible, would be a phenomenon of a totally dif- 
ferent order from organic Evolution, and the two could 
throw no light upon each other. No one suggests that the 
mature animal or plant ever passes into some other type. 
The followers of Darwin suppose merely that it may pro- 
duce a progeny varying more or less from itself. Now the 
crystal has no vital cycle, and is not reproductive. Here, 
therefore, the comparison breaks down. 
Mr. Pusey, in dealing with the palaeontological evidence, 
pronounces it “ possible, however unlikely, that some day 
we may find a true horse contemporary with Orohippus.” 
Be it so : it will be time enough to deal with such a pheno- 
menon when it arises. 
The author refers, in passing, to the attempts made by 
Sir W. Thomson and other physicists to limit the Earth’s 
past duration. When it can be shown that the data upon 
which their calculations are founded are anything better than 
arbitrary assumptions, it will be early enough to regard them 
in any other light than as mathematical exercises. 
The theory of “ Sexual Selection,” as supported by Mr. 
Grant Allen, is severely but ably criticised. Why, the 
author asks, are grass-eating Mammalia never green ? If 
animals are attracted by the colour of their food we might 
expeCt cattle, sheep, deer, &c., to be predominantly green. 
“ The thing which requires to be accounted for is not simply 
the presence of bright, but the presence of various different 
bright colours, arranged often in beautifully different pat- 
terns, separately characteristic of different living forms.” 
Many of the author’s strictures on “ Natural Selection ” 
are very just. In common with most naturalists of the 
Evolutionist school, he fully recognises that such selection 
may preserve types possessing some distinctively advan- 
tageous feature, but can originate nothing. He remarks 
that in the highest, and therefore according to Darwin the 
latest developed of brutes, — to wit, the anthropoid apes, — 
“ we find considerably lower fertility than in most other 
animals, and a longer period of infancy compared with the 
whole life of the creature. So that these high Primates 
must have lost instead of gaining (as far as the struggle for 
existence is concerned) in the course of their development 
out of lower types.” It is further urged that the higher 
