FOREST AND FORESTRY DEFINED. lOl 



as well as general physiology and biology ; finally, 

 he must specialize and become an expert on bio- 

 logical dendrology, i.e. a knowledge of the life 

 history, the development, and dependence upon 

 surroundings, the ecology, of trees, in individuals 

 as well as in communities, — a very special study, 

 to which few botanists have as yet given much 

 attention. Forest crop production, or silviculture, 

 in its widest sense, may be called applied dendrol- 

 ogy. And the forester is not satisfied only to know 

 the general features of the biology of the species, 

 their development from seed to maturity, their 

 requirements regarding soil and light conditions, 

 but as he is a producer of material for revenue, he 

 is most emphatically interested in the amount of 

 production and the rate at which this production 

 takes place. Far different from the agriculturist's 

 crop, his is not an annual one, but requires many 

 years of accumulations, and as each year's waiting 

 increases the cost of production by tying up the 

 capital invested, it is of importance not only to 

 know the likely progress of the crop, the mathe- 

 matics of accretion, but also how its progress may 

 be influenced. 



In this connection the study of geology and 

 meteorology, of soil and climate, the factors of site, 

 is required, as far as necessary to understand the 

 relationship of plant life to surroundings, and 

 teach the chemico-physical basis for wood produc- 

 tion. The protection of his crop not only against 



