AGRICULTURE IN THE TROPICS 391 
lems in the Tropics, and as a textbook for those who, thoug 
living at home, are interested in the various industries described, 
Dr. Willis’s book wi welcome 
he takes of agricultural questions are thus necessarily to a great 
extent through Sinhalese glasses. This in itself is not entirely a 
study of questions of tropical agriculture, and Dr. Willis’s sugges- 
tions will no doubt give new ideas to those working at scientific 
agriculture in other parts of the world. 
The author repeats the opinion which he has expressed before, 
that “there are now practically no new products of the old kind 
which can be introduced into the country.” The introduction 
recently of various new rubber-producing plants and the advances 
in organic chemistry both point to the fact that the useful plants 
of the vegetable kingdom are by no means all discovered or pro- 
of enriching the world by winning from the jungle or the plain 
plants which can be profitably cultivated for food, textile sub- 
stances, or other useful purpose. 
The number of cultivated plants dealt with—more than a 
hundred and fifty—makes it difficult to give a general criticism of 
this part of the book. We would suggest that in a later edition 
the author should mention with each plant the conditions under 
which it can be grown, and some figures as to the profits which 
have been obtained in countries where the plant has been 
cultivated. 
The larger part of the volume consists of a careful consideration 
of the methods and conditions of tropical agriculture under such 
nt”; “Organization of Agriculture.” It is not the author's 
vitally important in tropical agriculture :—‘ The Diseases of Plants 
and their Treatment.” It is probable that more good has been 
drance to the spread of parasitic fungi and insects is har ] 
noticed by Dr. Willis. His book will be read by administrators 
who are controlling new lands where agriculture is in its infancy, 
and it is important for such men to realize that, before the land 
