100 



JlETER^nXATION OF THE IXCREMENT. 



The system presupposes, that the largest trees of the 

 mature wood were amongst the largest trees at all previous 

 periods of the wood's life. Although this holds good generallj-, 

 exceptions occur. Besides, the method is very troublesome in 

 execution. 



I. QUALITY. 



I. QUALITY. 



ir. QUALITY. 



10 20 bO 40 oO liO 70 bO <J0 100 110 12D 



AGE, IX Y'EARS. 



Fig. 35.— Graphic Representation of the Volume per Acre of 40 different "Woods nnd 

 their allotment to Three Quality Classes, according to Baur's method. 



ii. Bau: 



ilr.THOD OF rr.EPAKlXG YlF.LD TaUI.KS. 



After a sufficient number of normal sample plots on all sorts 

 of qualities and ages have been carefully measured (at least 30 

 for each quality class), the volumes are marked as ordinates 

 over the corresponding ages as abscis::8B (see Fig. 35). 



