Periodical Literature. 129 



large sheets, then killed with carbon bisulphide and used in the 

 compost heaps. The main point lies in the organization of the 

 crews to do efficient work, seven boys and girls being found the 

 best number under a competent leader. In two flight years a 

 portion of the territory has been cleaned, 22.5 million beetles were 

 caught at an expense of about $5,000. The results have been 

 gratifying, and it is expected that in the flight year 191 1 a supreme 

 effort will be made to get the whole area cleaned. 



Interesting is the calculation of the result effected in the addi- 

 tional increment secured, and in the decrease of the planting 

 expenditure for fail places. In 1899-1902, the planting cost was 

 $53 per acre, in 1903-6 $12, in 1907-10, after the campaign of 



1907. $3-30- 



In increment an annual increase to the value of $10,000 is 



figured, showing that the expense is worth while. 



Bin Jahrzehnt im Kampf mit dem Maikdfer. Forstwissenschaftliches 

 Centralblatt. December, 1910. Pp. 633-644. 



MENSURATION, FINANCE AND MANAGEMENT. 



Dr. Matthes discusses at length conditions 

 Growth and management of a mixed beech-ash- 



Rate maple-oak selection forest in Thuringia, a 



in rare object in Germany. The private selec- 



Selection tion forests are usually the result of an at- 



Porest. tempt to convert composite forest into high 



forest. There are several types, namely 

 that with a close stand, in which the young age classes are lack- 

 ing; that showing a two-storied character; and that in which 

 the different age classes are present in groups — the normal 

 selection forest, which is rare. We are mainly interested in the 

 growth conditions which appear in several tables. 



The number of trees of different diameter on sample areas 

 were distributed as follows, for type I before and after a cut 

 intended to produce a young regeneration, for type II as it stood. 

 For type III no data are given. 



