62 THE AMERICAN NATURALIST.  [VoOu. XXXIII. 
he is a lover of dumb beasts as well as a student of their ways; and 
throughout his writing there breathes a frank and open spirit of 
inquiry, and a fitness of style which increases the acceptability of 
his work. In its sympathy and kindly appreciation for animals, its 
modesty, and its sanity and moderation of statement, the book is one 
of the most hopeful of recent contributions to the study of animal 
intelligence. ROBERT MacDouca.t. 
CAMBRIDGE, MASS. 
We have received the volume of Nature Novitates for 1897 from 
the publishers, R. Friedlander & Sohn, Berlin. This useful work, 
comprising, as it does, notices of all the more important books and 
articles of the year in Natural History and the exact sciences, together 
with valuable Personalia, deserves to be more widely known and used 
in this country. 
GENERAL BIOLOGY. 
Animal Grafts. — In the Sitzungsberichte der Gesellschaft zu Mar- 
burg, Jahrgang 1897, F. Marchand describes several sets of suc- 
cessful experiments in grafting one part of the body upon another 
part. Thus, in the rabbit he has transplanted the cornea of the eye 
from one animal to:the eye of another, and the transplanted part has 
taken root, as it were, so that in time the eye appears normal. He 
has repeated the older experiment of ingrafting the tail of a young 
rat under the skin of its own back. The tail continues to grow as it 
would have done in its normal position. The tail makes connections 
with the blood system of the body in its new location, and these con- 
necting vessels become large enough to carry on the nutrition of the 
parasitic tail. It is a case of perfect adjustment of the organism to 
new conditions. 
Regeneration of Extirpated Limbs.— Miss Byrnes (Anat. Anz., 
1898) has destroyed, by means of a hot needle, the body-wall muscula- 
ture in young tadpoles at the point where limbs were about to arise. ` 
Soon after the operation the cells lying ventral to the wound pushed 
up and closed it. From this tissue, which normally has nothing to 
do with forming the limb, the limb arises in normal form and size. 
[It may be added that this result is less properly called regeneration, 
_ which more frequently implies development from a rudiment of the 
_ regenerating organ, than regulation, by which a part— the ventral 
