530 Forestry Quarterly. 



square inches with 63 trees and 17 inches average diameter at 97 

 years ; the current increment having increased in the last 12 

 years to 163 cubic feet per acre per year. 



The stands h and c were brought to 80% of the cross section 

 of a, and the stand d also gradually near that figure, namely 180 

 square inches. During the first eleven years the increment on b 

 and c was greater than on a, in the next five years about equal, in 

 the last five years less; the total performance during the 21 years 

 came to about the same. The decline on the h and c areas was, 

 however, gradual, while the increase in the last period on a was 

 sudden, namely from 234 to 265 square inches. The Seebach 

 experiment behaved somewhat like stand a, but as here the 

 expense of underplanting came in, and on the stands b and c 

 weedgrowth and uneven regeneration has established itself, it ap- 

 pears that the method of severe thinning gives the best result. 



Bestandespfaege in Buchenbestanden, etc. Zeitschrift fur Forst-u. June, 

 1912. Pp. 386-390. 



Lagerberg reports the first appearance in 



Nursery Sweden of the destructive nursery fungus. 



Troubles Pestalossia hartigii Tub. The disease was 



in discovered in 1910 in a forest nursery near 



Sweden. Halmstad, where about 15% of the wild 



Silver Fir seedlings were attacked. In 



Germany the disease is known as "Einschniirungskrankheit" on 



account of the girdling at the base of the young stems, due to the 



death of the cortex at that point. 



After a discussion of the general characters of the trouble as 

 described by Hartig, Tubeuf, Rostrup and others, the author 

 minutely records his own observations. All of his material was 

 devoid of spores but he readily developed both conidia and closed 

 pseudo-pycnidia by placing the affected stems in a moist chamber. 

 These organs developed from the swollen portion of the stem just 

 above the girdle. Sometimes, in nature, the fungus will produce 

 spores the same years as the infection, at other times it takes 

 longer, particularly with older plants. The stem lesions were 

 typical and the effect was the usual one which accompanies gird- 

 ling, with the consequent interruption of water and food sup- 

 plies. In the efforts to heal, a sort of sleeve of new tissue pushed 

 down from the swollen callus above the lesion, so that the diseased 



