Periodical Literature. 633 



of spruce and fir the difference was 12.5 to 16% of the meas- 

 ured stand. 



In order to obviate these discrepancies between tables and 

 actual result the forest administration of Baden last year ordered 

 for all conditions a reduction of 10% in the use of volume tables 

 for working plans. 



In Bavaria on the other hand, the new regulation for working 

 plans, of 1910, calls for the opposite method, namely addition 

 to the actual felling results. 



The author points out that by these arbitrary methods the pos- 

 sibility of comparison of results is vitiated. Especially if deduc- 

 tions are to be made as to changes in stock and increment, con- 

 clusions become dangerous, since a lo-year increment per cent, 

 may be entirely lost in these allowances. Such inquiries, there- 

 fore, must be separately conducted and not be based on this kind 

 of booking. 



Ueber Bestandesmassenberechnung nach Massentafeln und Schlager- 

 gebnisse der Praxis. Forstwissenschaftliches Centralblatt. August, Sep- 

 tember, 191 1. Pp. 430-441. 



An article by Japing with elaborate tabula- 

 Relative tions and diagrams as a result of measure- 



Increment ments continued for 18 years in a spruce 



of stand, at the time of beginning 47 years 



Tree Classes. old, brings data to show the participation 

 of different tree classes, differentiated either 

 according to Kraft (see F. K., vol. Ill, p. 41), or simple diam- 

 eter classes arranged by equal numbers, in the progressive vol- 

 ume production, and the changes in position of the different tree 

 classes. 



The five diameter classes — the same number of stems in each 

 class — beginning with the stoutest, participated, varying at seven 

 different measurements, to the following extent in the total incre- 

 ment percentically : 



Class I, 35 to 41% ; class II, 24 to 30% ; class III, 16 to 23% ; 

 class IV, 10 to 14% ; class V, 4 to 9%. 



It was found again, as previously by Weise on the same sample 

 area that "the stoutest stem classes participate in the total incre- 

 ment with the same per cent., that they have in the total volume; 



