No. 409.] REVIEWS: OF RECENT LITERAFTURKE. 57 
When an adult was kept thirteen hours in the air there were no 
normal developments from the eggs as first shed, but when these 
eggs were kept four hours in water seventy-five per cent developed. 
The author interprets this as meaning that the eggs were in a “ state 
of semi-asphyxia " and gradually recovered in the water. 
The action of sperm upon moribund eggs is remarkable in that it 
hastens their disintegration, causing them to form blister-like eleva- 
tions, to become vesiculated, and to exhibit a sort of pseudo-cleav- 
age. When dead the eggs are not changed by sperm and keep 
their form for days. B AE 
Animal Life. — This text-book of zodlogy is outside the usual 
line, as might be expected in one of Appleton's **twentieth-century 
text-books," written by the president of Leland Stanford University. 
Like the Study of Animal Life of Arthur Thomson, it is not a labora- 
tory manual but a book to be read for stimulus and instruction, not 
for training in observation and deduction. 
It is a book on animal * ecology," emphasizing life as adaptation. 
In it structure and function go hand in hand, function leading the way. 
The authors briefly consider the activities of the Protozoa, and 
the lowest Metazoa, then take up chapters upon the sex and repro- 
duction of animals, function and structure, the life cycle, the primary 
conditions of animal life, the crowd of animals and the struggle for 
existence, adaptations, animal communities and social life, commen- 
salism and symbiosis, parasitism and degeneration, protective resem- 
blances and mimicry, the special senses, instinct and reason, homes 
and domestic habits, and the geographical distribution of animals. 
Its simple elementary treatment, excellent illustrations, and the 
piquancy of new facts gathered from the Pacific shores make it 
a most attractive volume which should play a good part in awaking 
interest in zodlogy. Yet used as “a first book” and, it may be, as 
an only book, there is danger of catering to the desire to know what 
we now think of animals rather than to know animals themselves. 
E. A. A: 
The World of the Great Forest.'— This latest product of Du 
Chaillus busy pen is an endeavor to present to young people a 
1 Jordan, D. S., and Kellogg, V. L. Animal Life. A First Book of Zoólogy. 
New York, Appleton, 1900. 311 pp. 180 figs. : 
? Du Chaillu, Paul. Zhe World of the Great Forest. With over fifty illustra- 
1900. 322 pp. 
