KEQUIREMENTS FOR THE BEST SERVICE. 



13 



need of fuel might be much inconvenienced to lind no 

 trees on his woodlot big enough for cordwood. and it 

 would not help him to know that twenty years later he 

 would haye an oyersupply. In the same wslj a larger 

 forest may yield onh^ a yery irregular and unsatisfac- 

 tor}" product if at one time there are too many ripe 

 trees and at another too few. For example, if 100 

 acres become fit to cut this 3"ear, and 200 next 3'ear, 

 and after that none at all until 500 acres become ripe 

 fifteen 3^ ears later, it is eas3" to see that the 3'ield would 

 come at yery irregu- 

 lar and perhaps yer3' 

 inconyenient times. 

 But a forest of 

 10,000 acres, com- 

 posed of 100 eyen- 

 aged groups of trees 

 of eyery age from 

 1 to 100 T^ears, each 

 group 100 acres in 

 extent (see fig. 5), 

 would plain h^ be able to furnish eyery year 100 acres 

 of 100-3^ear-old trees ready for the ax. In such a for- 

 est the right proportion of young trees would alwa3^s 

 be coming on. 



The fourth requirement is growing space enough for 

 eyer3^ tree, so that the forest as a whole (see fig. 7) 

 may not onh^ produce wood as fast as possible, but 

 the most valuable sort of wood as well. If the trees 

 stand too far apart, their trunks will be short and 

 thickly covered with branches, the lumber cut from 



10 



9 



e 



7 



6 



S 



4 



3 



2 



1 



n 



IZ 



ij 



,^ 



15 



16 



'7 



18 



19 



20 



30 



29 



28 



27 



26 



25 



24 



ZZ 



22 



21 



3\ 



3Z 



33 



34 



35 



36 



37 



33 



39 



40 



SO 



49 



48 



47 



46 



45 



'14 



43 



42 



41 



51 



52 



53 



54 



55 



56 



57 



58 



59 



60 



70 



63 



68 



67 



66 



65 



64 



63 



62 



sr 



71 



72 



73 



74 



75 



76 



77 



78 



79 



80 



30 



89 



88 



87 



66 



85 



84 



83 



82 



81 



SI 



92 



93 



34 



95 



96 



97 



38 



99 



100 



Fig. 5.- 



-Diagram of a forest -with one hundred 

 even-aged compartments. 



