4/8 Forestry Quarterly. 



The different kinds of thinning exhibit characteristic results. 

 After moderate thinning in the subordinate stand the stouter 

 stem classes benefit generally more. In the selection thinning ir- 

 regularity is striking. In the thinning par le haut the maximum 

 increment comes to the middle class III. Nevertheless, the in- 

 crement per cents of total volume are little different, as in the 

 previous case, varying only as 3:3.7:3.4:3.6. Applying now the 

 ascertained data to the formula and choosing p=3, the final result 

 makes the three different kinds of thinning as 152. i : 75.2: 147.8. 

 That is to say the selection thinning is financially only half as 

 effective as the other two kinds, which are pretty nearly alike in 

 their results. The second object of thinnings, the money interest 

 instead of wood increment, is particularly advantageous in the 

 thinning in the subdominant, not so in the thinning par le haut, 

 and least in the selection thinning. The increase in increment 

 on the main stand appears as 86: 113 : 129 for the three kinds of 

 thinning. 



The author believes to have proved that in the statistics of 

 thinning practice only exact calculations yield reliable results. 



Diirchforstungsversuche in Buchcn-und Kiefernbestanden. AUgemeine 

 Forst-u. Jagdzeitung. March, 1914, pp. 84-90. 



Kiinkele in a very elaborate article of 

 Determining 50 pages develops a method of evaluating 



Value the value increment per cent of standing 



Increment trees, as well as stands, which should be 



sufficiently accurate and at the same time 

 simple. The article is divided into five parts : Influences deter- 

 mining wood prices ; mathematics of price curves ; value incre- 

 ment of single trees ; value increment of stands ; helps and ex- 

 amples of the use of the new formulae. In the first part some 

 interesting data are brought showing, that length of log influences 

 the price only of small sized sticks essentially [masts? Ed.] ; 

 quality of wood influences price more than length, especially in 

 pine and that increasingly with size ; but by all odds the greatest 

 influence on price is exercised by diameter, increasing up to a cer- 

 tain size which varies with species. A table giving prices for 

 24 species paid in the Baden State forests exhibits the precise 

 variations. An idea of the relative value of species may be 



