62 FOREST PLANTING. 



account is made up by figuring all the revenue derivable 

 from the forest during the growing period, and carrying 

 it forward with compound interest to the cutting time. 

 The value of the wood at the cutting time is found by 

 the help of tables based upon certain methods of de- 

 termining accretion in yearly mass, and large ex- 

 perience for every variety of wood in any kind of soil 

 and location, and this amount, added to the sum of 

 the revenues with compound interest, forms the credit 

 account. If from this amount is deducted the total 

 of the debit account, the difference is the amount of 

 the net revenue. For instance : the 80 years' growing 

 period for a certain plantation shows that the invested 

 capital of 110 for an acre would yield, at the end 

 of this period, a net revenue of about $154; while 

 the 50 years' period by the same calculation netted $110 ; 

 the GO years', $125; 70 years', $130; 90 years', $140; 100 

 yearp,', $130; 110 years', $130— the 80 years' period 

 would be considered the most profitable, netting over 

 four per cent, interest, and the others less. 



The term "Forest Gardening'^ is sometimes under- 

 stood to signify a special mode of systematic forest cul- 

 ture, quite distinct from the others now in use. But this 

 phrase, correctly applied, means simply a plenter man- 

 agement made serviceable in certain localities, and under 

 certain conditions. While the forester has generally to 

 deal with the aggregate of trees in the woods, his at- 

 tention is not infrequently claimed by single trees, or by- 

 groups or rows of trees, which serve to protect the soil 

 from the influence of sun and air, and the neighborhood 

 from the effects of sudden atmospheric changes. In such 

 cases extraordinary measures must be taken to prevent, 

 at all events, openings in the woods ; the single trees 

 have to be always watched, and those, which from over- 

 matureness or other causes are incapable of affording ef- 

 fects which would justify their preservation, must be 



