1. V/orlring Ciroleo. 



Different areas each of vrhioh can be node 

 to give a "sustained yield.- 1 Thoy are not 

 circular, the .vord"clrclo t< boing, usod for 

 ether reasons . 



2 Bloc' 



Divisions of c. working circle. 

 3. Compartments 



Divisions of blocks. 



Theeo tor-ire aro not" fixed onoc yet. Occasion- 

 ally tho working circle appears under another name 

 entirely Compartments, in tho nonse in which the word 

 seems to be used by Mr. liooro.-- that is, aa a small 

 division of the forost, say a logging unit involving 

 only one year's cut, vriil probably not bo needed on 

 National Forests for ;:o-*o tiroo to oor"o, so nothing fur- 

 ther need be said of thei^i here, 



Lot us consider the vrorking circle and the 

 block separately. The basis on v.'hich a Forest io 

 divided into working circles is made up of three things, 

 Theso are: 



Geographic situation. 

 Markets. 



Ability of the format area that 3t is 

 intended to include in any one 

 workinr circle to produce 

 timber right along, indefinitely. 



By this, any area of a foreot forming a sort of unit by 

 reason of its topography, and supplying a certain market, 

 and able to produce timber right along would be made ono 

 working circle. For instance here on tho Trinity 

 Forest, the Stuart ; s Fork Block and Cottonwood Block, 

 of the present cystem of considering the Forest,- this 

 being an area ablo to produce a timber crop right along, - 

 sending, under advanced management, ito surplus over 

 local demands to Sacramento Valley markets, might fona 

 one v/orking circle. The oront working circles 

 are called diviu^oris. Thi3 then might be called the 

 Valley Division of the Trinity National Foreot. 



Another instance roadl?.y coming to mind is that 

 of tho present Soath For]: Bl<. ich mipht alone be 

 the South ForV Division. A^in- -ta of Ranger 

 districts five, two sr.a -t of six, Might 



form a wor' ' . frlalon 



Or ih* Coaot fxvlbioa of tha Trinity National Poret 



