PERIOD OF FELLING. 77 



cubic feet per annum, or 33 per cent, in favour of 

 the longer period in mere quantity, to say nothing 

 of the higher price realisable from 60-feet spars 

 in comparison with 30-feet spars. 



From this it will be seen that an important 

 element in forest administration is a careful deter- 

 mination of the period of felling which will give 

 the highest pecuniary results. 



But forest increment is a science of itself, and 

 to lay down instructions for determining the 

 relative growth of trees at various stages would 

 involve a certain amount of technicality foreign 

 to* the purpose of this little work. Pressler's 

 Forstzuwachs-Kunde, published by Waldemar Turk, 

 Dresden, might be advantageously consulted by 

 those having an acquaintance with German. 



