Periodical Literature. 273 



Without cover, the soil at times lost its entire moisture avail- 

 able for plant growth. Albert sees the effect of the cover not 

 only upon the moisture contents of the soil, but also upon a num- 

 ber of other factors' and, for this reason, he believes that by cov- 

 ering the ground it will become possible to eliminate the failures 

 in the reforestation work in sandy soils. R. Z. 



Mitteilungen der Deutschen Landwirtschaftlichen Gesellschaft, 1912, 

 No. 3. 



SILVICULTURE, PROTECTION AND EXTENSION. 



Wimmenauer presents the results of cer- 



Thinnings tain investigations conducted by the Hes- 



in sian Forest Experiment Station. The ob- 



Beech ject of these investigations was to compare 



and the financial advantages of various meth- 



Pine. ods of thinnings, to wit: (i) thinnings 



from above, (2) thinnings from below, and 



(3) selection thinnings. The results show that the first two 



yield approximately equal money returns, whereas the last named 



lags far behind. The volume increment is greatest with (i), least 



with (2), and intermediate with (3). 



Many interesting figures are developed, in tabular form, and 

 the author reaches the justifiable conclusion that the static (com- 

 parison of values) of thinnings requires just as exact a division 

 into grades of timber secured as does that of the final yield. 



A. B. R. 



Durchforstmigsversuche in Buchcn- tind Kiefernhestdnden. Allgemeine 

 Forst- und Jadg- Zeitung, March, 1914, pp. 84-90. 



Weber briefs an interesting investigation 



Grades of the Royal Saxon Experiment Station 



of at Tharandt dealing with the influence of 



Thinning various grades of thinnings on the incre- 



in ment of Scotch pine stands. The investi- 



Scotch Pine. gation was made on the State Forest of 



Kunersdorf near Schandau. It was begun 



in 1862 when the stand was 20 years old and was ended in 1912, 



when the stand was 70 years old. During these 50 years three 



comparative areas were thinned ten times, to wit: in the years 



