
472 THE ZOOLOGIST. 
especially the lepidopterist, will read with eager interest that in — 
the Dobrudscha Lelia cenosa, in the larval condition, were 
found in great abundance on reed-leaves. 
We have enjoyed the perusal of this very fully and beautifully 
illustrated book. It is one in which the ornithologist will find 
facts, and it will rejoice the heart of the collector by recalling 
reminiscences of other days. 
Experimental Zoology. Part I. Embryogeny. By Hans Przreram, 
Ph.D. Cambridge University Press. 
WE read that the plan of an ‘ Experimental Zoology’ grew 
out of the revised edition of the author’s ‘Introduction to the 
Experimental Morphology of Animals,’ which appeared three 
years ago. This great work, revised, supplemented, and illus- 
trated, will now be procurable in parts or subjects, of which 
the present is the first, and may be purchased separately, thus 
conferring a boon on students who do not desire the whole 
series. The English translation has been made by Miss Hertha 
“Sollas, and has been revised by Mr. R. C. Punnett, of Gonville 
and Caius College. 
Of course this work is of a much more technical and abstruse 
nature than the bionomical standard of zoology upheld in ‘ The 
Zoologist,’ but it is the most complete work of the kind to date, 
and we give one extract in illustration. Under ‘‘ Influence of 
External Factors” and the subject ‘‘ Moisture”? an abstract is 
given of one of the results obtained by P. Kammerer: “* If we 
mature Alytes spawn in its normal environment on land we may 
observe that the larve which emerge and crowd into the water 
require a period of development many times longer than that of 
the other anura; and Hyla spawn matured on land gives larve 
which require a year for their development instead of a few 
weeks. But if we bring Hyla spawn to maturity in its normal 
environment in water the larve born in May are metamorphosed 
in August of the same year, and the same occurs when Alytes 
spawn developes abnormally in the water; the young toads are 
developed from the larve in an equally short time.” 
The volume, besides its illustrations, contains for the subject 
a bibliography to date. 

PRINTED BY WEST, NEWMAN AND CO., HATTON GARDEN, LONDON E.C. 
