55G Forestry Quarterly 



ning (in the subdominant). Severe thinning is becoming general 

 practice ! 



The site classification is based on average height at 100 years, 

 running for the five site classes as 50, 64, 78, 93, 107 feet. The 

 secondary stand shows heights from 10 to 14 feet lower. The 

 remarkable statement is made that after the 100th year the height 

 curve of all sites lies in one and the same line. 



The question, what is the basal area which assures the opti- 

 mum increment, these tables answer differently from Schwap- 

 pach's, who found that with a basal area of 80 to 100 square 

 feet per acre the best increment occurs for the beech after the 

 70th year. In the 100th year the I site shows a stem number of 

 138 trees, with a basal area of 140 square feet and a wood volume 

 of 9170 cubic feet, while the thinning material adds 1144 cubic 

 feet, double what hitherto had been removed in thinnings ; the 

 iDasal area after that is kept slightly increasing. 



The reviewer points out that assortment and money tables 

 can have only restricted local value. The method pursued in 

 constructing these tables is the same which Schiffel employed 

 in developing his laws of increment for spruce {see F. Q. II, 

 p. 258), since Wimmer found that the same laws applied to 

 beech ; the work wood per cent was determined for the whole 

 stand, and then distributed over the six stem classes. 



Ertrags- und Sortimentsuntersuchungen im Buchenhochwald. Mitteilungen 

 des forstlichen Versuchwesens Badens, Heft 2, 1914. 



Dr. Wappes, a prominent Bavarian ofd- 



Metuuration cial, noted as an advocate of systematic 



of procedure, discusses the ways and means 



Mixed Stands of measuring mixed stands. Data on 



stands of a single species are abundant. 



With the tendency towards mixed stands, it is high time that 



equally good data be obtained for these also. 



The first part of his article throws light on the character of 

 mixed stands and cites numerous cases in point. 



It is interesting to us that his first problem concerned itself 

 with the ascertainment of the mutual influence of White pine 

 with Scotch pine and Norway spruce in mixture. Another prob- 

 lem suggesting the need of devising a technique and for investi- 

 gating mixed forest was how to convert a pine-beech forest on 



