SYLVICULTUEE. 



denser cover overhead may intercept too much of the needed rain- 

 fall. 



If the climate is too cold, the moisture of the air indeed 

 increases; but the production of seeds and the persistence under 

 cover decrease. 



Y. In mixed forests artificial regeneration is more difficult than 

 natural regeneration. A clean felling results in a capricious com- 

 plication of natural laws and phenomena whose contrary actions 

 are not easily understood. Xatural regeneration, a mixture ot 

 species suitable to the locality, a crop resembling as closely as pos- 

 sible the primitive state, such are the conditions which the forester 

 should seek to realize for the avoidance of dangers as well as f'<r 

 the greatest possible yield of the most valuable produce. No 

 method of treatment harmonizes better with nature's laws than 

 the so-called selection system, when each tree is placed in a con- 

 dition most favorable to its development, and when no single tres 

 is removed for a purpose other than that of regeneration or im- 

 provement of the crop. 



40 



