No. 403.] REVIEWS OF RECENT LITERATURE. 605 
ing his report to insects affecting shade trees. He also recards the 
result of observations made in 1899. 
Messrs. Henry Holt & Co. publish (New York, 1899) a new issue 
of Scudder’s Brief Guide to the Commoner Butterflies of the Northern 
United States and Canada. The text shows but slight change from 
the original of 1893. The illustrations, borrowed from other works, 
are new to this issue, and give, with varying success, figures of the 
eighty-four species treated in the text. 
* The Recognition of the Poisonous Serpents of North America,” 
an address with a demonstration to the graduating class in the 
medical school, before the Johns Hopkins Medical Society, by 
Professor Howard A. Kelly, is printed in the Buletin of the Johns 
Hopkins Hospital, Vol. X, No. ros. Figures of six snakes, three 
| Poisonous species and three harmless species, illustrate the paper. 
The disadvantages under which a physician labors when dealing with 
a purely zoólogical subject are clearly shown in the text. 
BOTANY. 
An Experimental Botany.— Teachers who believe in approach- 
ing the study of plants from the physiological point of view will 
welcome Dr. MacDougal's latest guide. The book is intended for 
the use of beginners who have not the facilities of a laboratory. 
Only a hand magnifier and such apparatus as may be extemporized 
readily with the aid of household articles are required in the observa- 
tions and experiments to which the student's attention is directed. 
It will be a surprise to many teachers to find how fully the more im- 
portant general principles of plant physiology may be illustrated by 
these simple experiments, while the young people who perform the 
experiments cannot fail to be delighted with what they will witness, 
and be led to valuable general ideas of plant life. The book abounds 
in fresh and i inspiring suggestions. 
It must be said, however, that users of the book are assumed to 
have acquired sufficient knowledge of systematic botany and facility 
1 MacDougal, Daniel Trembly, Ph.D., Mens of the Laboratories, New York 
Botanical Garden. The Nature and Work of Plants: an Introduction to the 
Study sf NGC New York, The Macmillan Company, 1900. Cloth, 12 mo. 
xvii + 2 
