NOTICES OF NEW BOOKS 197 



Perhaps, however, terms are immaterial in comparison with the 

 conception which they convey, and as this depends not on the 

 counters used, but on the plane of thought at which one has 

 arrived, a change of word may not help so much as desired. If 

 we do not use the word " species," why use the word " genus " ? 

 the last being a little more artificial than the first, at least in 

 a philosophical sense. However, the writer shares with the 

 author his dislike of definitions which may, or already have 

 developed into rigidities, but at the same time thinks it better 

 to enlarge the conception of a term rather than to duplicate it 

 by another word. 



This very useful volume possesses ten coloured plates, and 

 some hundred photo-blocks distributed in the text. 



