SYSTEMATIC FORESTRY 123 



of receipts over expenses, and then for many 

 years nothing has been received and expenses 

 annually incurred. By placing on the same 

 page the results of different years the owner 

 can see at once the net result of the inter- 

 mittent gains and losses. 



A book should be kept showing the stock of 

 timber in each wood or subdivision of a wood. 

 The stock-taking need not be expensive. Woods 

 under twenty-five years are sufficiently entered 

 as good, fair, or bad, and an estimate given of 

 the blank spaces. The cubic contents of the 

 older woods can be estimated, and the method 

 of estimation stated, as, for example, so many 

 trees per acre and so many cubic feet per average 

 tree. The entries progressively grow more accu- 

 rate, both by comparison with actual measure- 

 ments when trees are felled and by greater 

 experience in forming estimates. 



A book of this description, annually made up, 

 shows the rate of increase of timber in each 

 wood. It shows which woods are thriving and 

 which are making slow progress. It also gives 

 the owner knowledge of the changes in the 

 aggreggate of timber in his woods. 



One result of close attention to the growth 

 of the timber in woods will be the disappearance 



