16 Forest Management 



The chief working plan requires revision and is invariably re-drawn 

 before the lapse of many years whenever the facts are altered on which 

 the plan was based. 



The subheads of a chief working plan [under the chapters "facts," 

 "d«sire of the owner," "plan"] are: 

 Forest survey (f XII). 

 Description of locality (H XIII). 

 Yield tables and volume tables (If XIV). 

 Problems of silviculture and of protection (H XV). 

 Forest utilization (If XVI). 

 Forestal investments (If XVII). 

 All data ascertained and all changes planned should be shown, if 

 possible, on maps allowing of rapid reference. 



The scale and the detail of the maps depend on the value of the in- 

 vestment per acre. 



PARAGRAPH XII. 



FOREST SURVEY. 



The objects of a forest survey are: — 



1. Outside boundaries and those of interior holdings. 



2. Railroads, rivers, creeks, blufifs and other obstacles, and means 

 of transportation. 



3. Lines between localities having different laws, inasmuch as they 

 influence forest management. 



4. Differences in ownership. 



5. Boundaries of the various forest ranges. 



6. Configuration. 



7. Differences of soil; mineral possibilities. 



8. Dividing lines between forest soil, farm soil, pasture soil, and 

 mineral soil. 



9. Lines of working circles', if there are any. 



10. Roads, trails, and fire-lanes. 



11. Age, species, and quality of growing stock, Jiccording to com- 

 partments. 



It is not necessary, of course, that all of these points should be ex- 

 hibited in all working plants. 



PARAGRAPH XIII. 



DESCRIPTION OF LOCALITY. 



The "locality" is usually described by compartments. The "quality 

 of the locality," which means to say its productiveness, is a function 

 of soil and climate. 



The height growth of the trees yields the best indication of the 



