210 REVIEWS. 
such tests, and whether the prospect of such a test would be an 
adequate incentive to a lazy student to do his daily work. 
The author makes elaborate citations from Poincaré showing 
that energy is the unifying and simplifying idea in science, and 
from this argues that the elementary work should be built about 
this idea. The argument is almost too pretty in theory. He 
rightly emphasizes the importance of the reaction of the student, 
but the boy in whom the reformed teaching would produce the 
desired reaction is the boy who would probably go to college. 
He is in the minority for whom the course is not to be adapted. 
The problem is the base individual who is just on the point of 
throwing up the whole business. He needs the prospect of a 
clean-cut, searching examination. It is doubtful if the proposed 
scheme would help him. 
The whole book is doctrinaire and to a great extent impracti- 
cable; it neglects the personal equation both of the teacher and 
student. Pedagogically, however, the book is extremely interest- 
ing and the discriminating reader will reap from it some new 
and useful ideas. 
OMH=SE: 
The Microscopical Examination of Foods and Drugs. By Henry George 
Greenish, F. I. C., F. L. S. With 209 illustrations. 2d ed.  Phila- 
delphia. P. Blakiston’s Son & Co., 1012 Walnut Street. 1910. 
Pp. i-xx + 1-886. Cleth. Price $3. 
This book is a valuable reference for the food analyst, the 
pharmacist, and the student. The method of treatment is not 
changed from that followed in the first edition except that ~ 
the chapter on fibers has been revised with the assistance of 
Miss Agnes Borrowman. Several additions have been made. 
and a chapter on the more commonly recurring adulterants of 
powdered foods and drugs has been added. 
Characteristics of Existing Glaciers. By William Herbert Hobbs. Cloth. 
Pp. xxIv-301. Price $3.25 net. New York. The MacMillan Company. 
1911. 
This work is illustrated by six plates and 140 text figures. 
The object of this book is to set forth views in relation to 
alimentation and depletion of glaciers, to emphasize the exist- 
ence of two distinct types and one intermediate type of glaciers, 
