Periodical Literature. 1 13 



In no phase of forest mensuration has American practice lag- 

 ged further behind European precedent than in the construction 

 of yield tables, (and this is not to be wondered at!) hence this 

 study by Borgmann is so far in advance of our times that a 

 detailed review thereof is scarcely justified. 



One or two points of especial interest shall, however, find men- 

 tion here : 



The newer yield tables, leased upon a heavier degree of thin- 

 nings have brought about a later culmination of the mean an- 

 nual increment and with it of the maximum soil rent (financial 

 rotation.) The culmination is later on good site qualities than 

 on poor ones, as the following average table shows (calculated 

 with a uniform interest rate of 2^-%.) 



Site Quality I III V 



Financial Rotation (in years) 



1. Spruce (P. exceha), 85 



2. Fir (A. pectinata). 100 



3. Pine (P. silvestris), no 



4. Beech (F. silratica), . . . 120 



5. Oak (O. pcdiinciilata), . . . 140 



Dr. Borgmann's article includes the latest Saxon yield table 

 for spruce which is herewith reproduced in full. The reviewer 

 is especially glad of this opportunity since the table given in 

 his article "Management of Spruce in Saxony" (Forestry Quar- 

 terly, V^olume XI, No. 2, p. 147) is unfortunately misleading 

 through the use of a conversion factor (.17) which gave too 

 high results. Indeed, a general factor for translating cubic meter 

 per hectar into feet board measure being impossible, only the fig- 

 ures for the financial rotation (80) years) are so translated by us- 

 ing the factors. .01-.08. 



