396 Forestry Quarterly 



pensive. Kubelka recommends a new construction, which Gut- 

 tenberg claims to have been suggested in 1896 by his assistant 

 Raschke. It consists of a simple transit in the diaphragm of 

 which a fixed and a movable vertical hair or else two horizontal 

 movable metal points are inserted to enclose the diameter to be 

 measured at any height, while the vertical hair contains besides 

 the usual gradation in degrees a tangent gradation, which latter 

 permits the finding of the height. To measure the diameter, the 

 apparent diameter between the two metal points or hairs is sighted 

 and read off from a scale set up at the same distance. 



[In this connection we call attention to Burton's Biltmore 

 Pachymeter (see F. Q. IV, p. 8), which is the simplest device 

 for measuring diameters at different heights, and needs no staff 

 or tripod, but a hypsometer.] 



Whether the new dendrometer will permit widespread use in 

 practice may depend on the cheapness of its construction. 



Guttenberg shows that he antedated Schiffel's development of 

 the formquotient. 



Die Stqmmkubierung und Hohmassenermittlung mil Hilfe dtz Formquo- 

 tienten. Osterreichische Vierteljahrsschrift fiir Forstwesen, 1915, pp. 38-44. 



HOnlinger has developed new and simpler 



New concepts, methods and formula for the 



Finance determination of the financial rotation. 



Rotation He points out that the soil rent theory 



Formula starts out with two false dogmas, namely 



that the net soil value can be determined 



only from the naked area and that a management class is the 



simi of so many independent single management units. Neither 



of these dogmas is an essential part of net yield calculations. 



He starts out with the value of a whole management class and 

 considers that when the net yield pays the best interest rate on the 

 forest value the most profitable rotation is used. 



There are two ways of calculating: either figuring the variable 

 rent value of soil and stands w4th a constant demanded business 

 interest rate, or else figuring what variable interest rate the forest 

 rent represents related to the constant forest value. 



