Current Literature. 419 



The general part of the report concludes with an account of 

 some very gratifying results obtained from efforts made in recent 

 years to control various outbreaks of Dendroctonus, especially 

 the extensive depredations of the Black Hills beetle. 



This is followed by a detailed account of the various species, 

 extending over 127 pages. Each species is briefly characterized, 

 its work, life history, habits and economic features are described, 

 and special methods of control given. 



The report is profusely illustrated with accurate text-figures of 

 the beetles and their work, and photographs showing the appear- 

 ance of infested trees. 



E. M. W. 



Diseases of Deciduous Forest Trees. By Herman Von Schrenk 

 and Perley Spaulding. U. S. Department of Agriculture, Bureau 

 of Plant Industry. Bulletin No. 149. Pp. 85. 



Not as one would expect from the title, but as one would ex- 

 pect from the authors, the greater part of this Bulletin, (fifty- 

 eight of the sixty-seven pages in the text proper), is devoted to 

 fungus diseases. The diseases of trees are discussed under two 

 groups, those caused by unfavorable environmental conditions and 

 those caused by living organisms. Under the former group, the 

 relation of trees to smoke and sulphur gases, unfavorable soil 

 conditions and extreme cold is briefly discussed. The diseases 

 caused by living organisms are treated under three subheads, 

 namely, those caused by insects ; those caused by the parasitic 

 higher plants and those caused by fungi and by bacteria. For the 

 first of the subheads, however, one is referred to previous publi- 

 cations and the latter subhead is chiefly devoted to the various rots 

 of standing trees and structural timbers. Only general descriptions 

 of the various fungi concerned are given, most of the discussion 

 being devoted to the response of the host to the disease. The 

 Bulletin closes with a discussion of the decay and prevention of 

 decay in structural timbers. It is accompanied by eleven figures 

 in the text, ten plates and a bibliography of one hundred and four- 

 teen numbers. C. D. H. 



Report on Fertilizer Experiments on Szvamp Soils. By R. 

 Harcourt, in Thirtieth Annual Report of the Ontario Agricultural 



