Periodical Literature 251 



Before the Botanical Society of America 

 Transpiration Burns reports on experiments with White 

 and pine seedlings to establish the relation of 



Chemical transpiration to their composition, which 



Composition show that both protein contents and sol- 

 uble ash per cent under full shade are, 

 where transpiration is low, very much higher than in half shade 

 or no shade. 



Science, January 29, 1915, p. 181. 



In the German Dendrological Society re- 

 Large-sised cord is made of several specimens of large 



Trees size of various species. 



In a park at Kunzendorf probably the 

 largest White pine in Germany is found, planted between 1790 

 and 1800, therefore about 120 years old, with a diameter breast 

 high of 63 inches, height 108 feet, crown diameter 69 feet, volume 

 1,370 cubic feet. 



At Potsdam a Robinia measures 56 inches with a height of only 

 33 feet, but a crown diameter of 53 feet. 



A hollow linden, still alive, near Upstadt measures 46 feet in 

 circumference. 



A specimen of Corylus colurna, 120-130 years old, in the botani- 

 cal garden at Hamburg has at 6.5 feet from base a diameter of 

 25 inches with a height of 82 feet, a rare specimen. 



Starke Waldbdume. Forstwissenschaftliches Centralblatt, February, 1914, 

 p. 132. 



In an address on Soil Cover and Humus, 

 Indicators Prof. Helbig made the following observa- 



of tions on the significance of grasses and 



Site mosses in judging sites : 



Succulent grasses (meadow grasses, Poa, 

 etc.) indicate better soils in healthy, normal condition; broadleaf 

 half-grasses (Scirpus, Juncus) prefer moist places; pasture 

 grasses (Aira) are inhabitants of raw humus layers and indicate 

 soil conditions inimical to tree growth. 



Branch mosses (Hypnum) indicate healthy soil conditions; 

 clinging to haircap mosses (such as Polytrichaceae and Dicrana- 



