180 JOURNAL OF FORESTRY 



periment Station. He found that top rot occasioned by various Poly- 

 porus species are a constant sequel of the snowbreak ; that in the first 

 years the disease develops conspicuously rapidly ; that the further de- 

 velopment depends upon the vigor of the tree, proceeding more rapidly 

 in the faster growing than in the slower growing specimens ; those 

 broken at a diameter of 10 cm. or more showing more rapid progress 

 of the disease; that woundwood formation and a resin cover retard 

 the rot, and can in some cases prevent it altogether. Altogether the 

 loss in stands of better quality is greatest, and in all cases earliest pos- 

 sible utilization is indicated. 



Snobrott och Topprota Hos Granen. Meddelauden fran Statens Skogstor- 

 soksanstalt Haft. 16. Nr 5, p. 115-165. 



The fears which were expressed by M. Doe in 



The Oidium the Rev. Eaux et Forets for March, 1919, as a re- 



and the Oaks suit of his experience in Champagne, that the 



of Western Didium may prove fatal to the oak in France, are 



France not substantiated by the history of the fungus in 



the western part of the country. Here, in spite of 



the fact that the disease has been present and at times virulent since 



1907, no serious damage has been done and no particular difficulty has 



been experienced in converting coppice stands into high forest. The 



explanation of the markedly different reaction of the oak to the oidium 



in the two regions appears to be that in Normandy and Brittany the oak 



is in the zone of optimum growth, while in the more continental climate 



of Champagne its physiological resistance is less. Even in western 



France, however, individual trees suiYer seriously from the disease 



when their vitality has been weakened by frequent pollarding or other 



mistreatment. S. T. D. 



L'oidiupi, et les chencs de I'Ouest de la France. L. G. Aiibert. Revue des 

 Eaux et Forets, 57:189-195. ' 1919. 



UTILIZATION. MARKET. AND TECHNOLOGY 



Prior to the war and the Russian revolution, 

 British Care England imported annually enormous quantities 

 With Russian of timber from Russia, both coniferous and hard- 

 Hardwood Timber wood, and British capital was very heavily in- 

 terested in sawmills in Russia. Russian oak was 

 a prime favorite with British cabinet makers. The Russian oak and 

 also other more valuable species, were brought to England in the whole 



