PERIODICAL LITERATURE 265 



measures in addition to the considerable higher prices instituted 

 by legislation, besides partial restriction of wood export. Owners, 

 more or less in debt, have taken advantage of the high prices and 

 over-cut and the danger of continued overcutting is pointed out. 



To alleviate these dangers, acquisition of public forest, federal or 

 cantonal, and reforestation is suggested, which would be easier now 

 than in peace time, when also a larger product per acre would result, 

 for it is notorious that private forests in Switzerland produce fully 

 15 cubic feet less in the average than public forests. Besides, the 

 cultural influences of forest cover could in that way be better attained. 



Eine gule Gelegenheit. Schweizerische Zeitschrift fiir Forstwesen, November- 

 December, 1916, pp. 229-31. 



In a paper before the Canadian Forestry As- 



Combating sociation. Dr. H. T. Giissow, Dominion Botanist, 



White Pine combats the idea of Mr. Rane, State Forester 



Blister Rust 3f Massachusetts, "to go ahead planting white 



pine as enthusiastically as ever, leaving the 



problem of its protection to be looked after by technically trained 



officials." The author wisely suggests stopping further planting and 



increase of host plants until the disease is controlled, especially since 



so far the only control known is eradication of diseased trees and 



diseased Ribes. By these means perhaps the disease may be brought 



under control and the sooner the eradication is done the better. 



In discussing the life history of the rust, the author points out that 

 decisive symptoms of infection may not become visible for a year or 

 two. Hence during this period of incubation it is difficult to diagnose 

 the disease ; and in transplants this incubation may be still further 

 continued, so that for some years the infection remains unobserved. 

 Old trees which are not killed, but lose only branches, serve for year? 

 as harborers of the disease, acting as propagators. 



Periodical inspection and removal of diseased trees has been found 

 more expensive and less effective than destruction of the ^vhole 

 infected plantation and replacement by healthy plants. 



The author points out that, while at present the disease in Canada 

 is mainly confined to the Niagara district, and can perhaps be con- 

 trolled by watching distribution of affected material, the problem 

 would become more complex if the northern pineries became infested. 



