PERIODICAL LITKKATLRI*. 585 



In connection with the foregoing discussion, 

 forest it is now possible to record the tentative instruc- 



Organization tions of the Swiss Federal Forest Inspection for 



/;; uniform methods of organizing the public (can- 



Szcitacrlaiid tonal ) forests. So far these are only suggestive. 



In the subdivision a rational net of roads is 

 to form the basis. Area as regulator of yield is to give way to volume ; 

 the are'a allotment is with few exceptions to be abandoned. The re- 

 liable ascertainment of stock and increment (average, at felling age, 

 and current ) is considered of greatest importance and methods are 

 suggested. Careful control by periodic inventory according to volume, 

 assortments, value, divided into main and intermediate yields, is pre- 

 scribed. 



In determining the rotation, the index per cent is to guide, which 

 necessitates investigations into value of stock and yield, but other 

 considerations are not to be neglected. 



The regulation of the yield is to be based on a felling place to be 

 checked by periodic felling area and formula. The reference to the 

 felling area as well as certain references to rotation, felling age, seems 

 to the reviewer, Hefti, to smack too much of clearing system. He ad- 

 mits, however, that until more reliable increment data are on hand the 

 use of the area is justified. The formula used is Meyer's, except that 

 the increment is not the average at felling age but the current, and the 

 normal stock calculated by the formula r x i x 0,4 ( or for spruce and 

 fir x-0,5), where i is also the current increment. 



We hoi)e eventually to brief these valuable, carefully formulated 

 working-plan instructions more fully. 



Schweizerische Zeitschrift fiir Forstwesen, June- July, 1918, p. 145. 



UTILIZATION, MARKET, AXD TECHXOLOGY 



In a very thoughtful and comprehensive dis- 

 AppUcd cussion, Percy Groom. Professor of Technology 



Timber of Woods and Fibres, Imperial College of Sci- 



Pliysics ence and Technology, covers the whole field of 



timber physics and their practical value to the 

 timber trade as an argument for wider development of this line of 

 investigation in Great Britain. The paper does not contain anything 

 new and is mainly valuable as a circumspect survey of the field. Spe- 

 cial emphasis is laid upon the influence of climate and soil on the mechan- 

 ical structure and practical value of wood of the same species, which 

 should be considered in afforestation schemes. 



