80 THE BOOK OF FORESTRY 
well posted in history and economics, for if he is to 
occupy an executive position he should possess broad 
vision. Mathematics of course is needed preparatory 
to surveying; chemistry is required in order that the 
process of plant physiology may be understood. Botany 
and dendrology are of course essential, for a forester 
must know his trees and shrubs and how they grow. 
A thorough knowledge of geology, the structure of rocks, 
the soils they make when they are weathered down by 
the elements, is of course indispensable. Finally, a 
forester must be familiar with the signs of insect attack 
and fungus diseases. The forester in charge of a valu- 
able timber tract noticing such attacks in their early 
stages may be able to prevent enormous financial loss. 
After these preliminary subjects have been com- 
pleted, advanced courses are taken in such subjects 
as forest protection, forest engineering—including 
map-making, road and trail construction—and forest 
mensuration—the measuring of the forest crop, ete. 
Lumbering and forest utilization are also covered and 
finally the science of forest management is pursued, 
which deals with the handling of a piece of forest 
property in a business-like way; the latter subject in- 
cludes the financial aspects of forestry, and the reg- 
ulation of the forest yield. It will be seen that the 
field is broad and the time spent in college is none too 
long to secure a thorough training in these important 
subjects. 
Need of Practical Training—To train graduates suc- 
cessfully a forestry school must be thorough and must 
provide an abundance of practical work. In hardly 
any profession, with the possible exception of medi- 
cine, is a book-taught man with little practical expe. 
