184 JOURNAL OF FORESTRY 



develop more summer shoots which are long and slender and with 

 diminutive buds strongly infected with mildew, often tliey do not 

 ripen at all and are therefore less frosthardy. Leaves of the Danish 

 oaks develop later in the spring and discolor earlier in the fall. 



J. A. Larsen. 



Hauch, L. A. Provenicmforsbg med eg. II. Det Forstlige Forsogsvasen i 

 Danmark, 5:195-224. PI. 6. 1920. 



A considerable quantity of acorns which had 



Storing Acorns been laid down in the fall of 1918 gave 40 per 



Tii'o Years cent germination in 1920. The author concludes 



that in order to preserve the acorns two years 



it is necessary to use Hauch's method the first winter and to put the 



acorns down dry the following spring in a dry sand and to lay them 



so deep that temperatures remain fairly constant. J. A. Larsen. 



Holten, A. To-aarig ophcvaring af agent. Dansk Skovforenings Tidsskrift, 

 191-198. 1920. 



BOTANY AND ZOOLOGY 



The Danish basswood is not generally a forest 



Trees and Shnihs tree though it is among the earliest recognized 



in Denmark arborescent in the country. Three species of 



basswood occur: (1) Tilia platyphylla Scop., T. 



grandifolia Ehrh. This species is here on the northern limit of its 



distribution. It entered Denmark during the warmer part of the 



post-glacial period and is now retrogressive both in Denmark and 



Sweden. (2) Tilia cordata. Mill. Syn. ; T. ulmifolia Scop.; T. micro- 



phylla Vent. ; T. parvifolia Ehrh. This is hardier and more of a 



forest tree and of more general distribution than the former. ( 3 ) 



Tilia cordata platyphylla ; T. intermedia D. b. ; T. europea L. A 



hybrid of rapid growth, vigorous but of limited distribution. It is used 



chiefly for shade trees and for parks. J. A. Larsen. 



Ostenfeld, C. H. Berndrkninger om Danske trders og buskes Systematisk 

 udvidehe. Dansk Skovforenings Tidsskrift, 164-182. PI. 5. 1920. 



