

APPENDIX. 



A. Normal Yield Tables. 



These tables will prove useful ifi giving actual reliable data con- 

 cerning forestry as a business. They will be helpful in preparing 

 problems for class use. 



American yield tables are still deficient ; practically all data 

 come from wild woods ; the growth of the individual tree is usually 

 determined on dominant trees only, the yields per acre on stands far 

 beyond a justifiable rotation; the effects of man's care in thinning 

 are yet to be learned. None of these data are as yet accepted by a 

 representative body of men. 



Under these conditions it seemed best to use the German tables 

 as worked out in connection with the forest experiment stations 

 and compiled by Professor Doctor Adam Schwappach, the foremost 

 authority in this line of study. 



The division into five sites was agreed to by the Experiment 

 Stations in 1888, and bases the division on the total volume of the 

 main stand and provides for the stand one hundred years old the 

 following relations: 



Site. Pine. Spruce and fir. Beech. 



I 100 100 100 



II 78 82 80 



III 60 66 64 



IV 43 50 49 



V 29 36 35 



In Schwappach's tables this relation is fairly adhered to as is 

 apparent from the following: total volume of the pure fully stocked 

 normal stand one hundred years old is : 



Site. Pine. Spruce. Oak. Beech. 



I 6600 c. ft. 11600 6200 10100 



I 100 100 100 ICO 



II 85 83 79 80 



III 69 66 58 64 



IV 55 5i 49 



V 43 36 35 



