274 THE ZOOLOGIST. 
affect us in the highest degree, &c. It is very quickly observed 
in insects that the faculty of perceiving certain emanations is 
intimately allied to their course of life, to their wants, and to 
dangers which they have to avoid. The female of each species 
is odorous to her male. A plant that attracts a certain insect 
from very far off leaves others indifferent, and is absolutely in- 
odorous to us,” &c. This argument strikes at the root of many 
of the generalisations now so frequently met with in popular 
bionomics. 
This volume is a real addition to our knowledge, and not in 
an entomological sense alone, though no entomologist should 
neglect its perusal. Prof. Forel is not infallible; he is some- 
what emphatic with those whose conclusions are not in agree- 
ment with his own, but he has nevertheless given us the best 
book on the subject. : . 
Animal Life. By F. W. Gamutz, D.8c., F.R.S., &e. 
Smith, Elder & Co. 
Tuts volume describes many phases of animal life, its sub- 
jects are of a selected nature, and it is written, as we are informed, 
from ‘‘ the evolutionary standpoint’; from that standpoint the 
book must be read and appreciated. Evolution is a conception ; 
it cannot be reduced to a formula, nor does it lend itself to the 
limits of adogma. We can state facts that support it, and can 
find none that contradict it, but the most able evolutionist is the 
one who possesses the largest mental concept of the cosmic pro- 
cess, and not he who uses the most extensive terminology to 
express it. It belongs to no one science; it qualifies alike the 
thought and action of humanity as it accounts for man himself. 
The biologist, however, may be said to work under this concep- 
tion; his facts are meaningless without it, his conclusions 
cannot escape it; the more he learns, observes, or discovers, a 
mighty hidden movement unfolds itself. Some devote their 
lives to the study of a single evolutionary manifestation, and in 
thus demonstrating a point not infrequently limit the conception 
of the whole. Dr. Gamble’s book is a short sketch of a wide 
biological area; it is extremely suggestive, and gives an impulse 
to the evolutionary idea rather than adding to evolutionary 
