DISEASES OF PLANTS. 445 



Manitoba, a forest Province, R. H. Campbell {Dept. Int. Canada, Forestry 

 Branch Circ. 7 {1914), PP- 16, figs. 9). — An address on the extent, condition, 

 and management of the forest resources of Manitoba, delivered before the 

 Canadian Forestry Association, at Winnipeg, July, 1913. 



Trent watershed survey, B. E. Febnow, C. D. Howe, and J. H. White 

 {Toronto: Com. Conserv. Canada, 1913, pp. VII I +156, pis 19). — This embraces 

 the results of a reconnaissance of the Trent watershed in Ontario. The subject 

 matter is discussed under the following general headings : Conditions in the 

 Trent watershed and recommendations for their improvement, physiograiihic 

 and forest conditions, and economic and industrial conditions. Information 

 relative to the lumbering industry in the Trent watershed, physical features and 

 geology of the area, mineral occurrence.s, and other miscellaneous data are 

 appended. 



Forest protection in Canada, 1912, C. Leavitt {Toronto: Com. Conserv. 

 Canada, 1913, pp. 174, pls. 23). — This comprises a progress report for the year 

 1912 relative to methods of forest protection and results secured, together with 

 considerable information on the subject of forest protection based upon observa- 

 tions and methods employed in ditfereut sections of the United States. 



The subject matter is discussed under the following general headings: Pro- 

 tection from railway fires, forest fires, and the brush disposal problem, the top- 

 lopping law in the Adirondacks, the use of oil as a locomotive fuel from a fire- 

 protective point of view, and forest planting in Canada. The report of the com- 

 mittee on forests, Conmiission of Conservation, 1912, presented at the annual 

 meeting at Ottawa, is also included. Statistical infoiiuation dealing with the 

 Dominion forest reserves area extensions, a memorandum regarding the country 

 between Sudbuiy and Port Arthur, by J. H. White, and various opinions on 

 oil fuel are appended. 



Cooperative forest fire protection, G. E. Bothwell {Dept. Int. Canada, 

 Forestry Branch Bui. 42 {1914), pp. 28, pi. 1, figs. 10).— In this bulletin the 

 author describes the development of cooperative forest-fire protective associa- 

 tions in America, particular attention being given to the development and work 

 of the St. Maurice Fire Protective Association in the Province of Quebec. 



The care of the woodlot, B. R. Morton {Dept. Int. Canada, Forestry Branch 

 Circ. 10 {1914), PP- 16, figs. 11). — A popular treatise on woodlot management 

 in eastern Canada. 



DISEASES OF PLANTS. 



The non validity of the genus Lasiodiplodia, J. J. Taubenhaus {Abs. in 

 Phytopathology, 4 {1914), No. 1, p. 47)- — The author states that during the 

 past two years his work with L. tuhericola and L. nigra and upon Diplodia 

 gossypii and D. natalensis shows that the presence of paraphyses is not of 

 constant occurrence. Under certain conditions it was found that either fungus 

 may dispense with paraphyses or produce the same, and in view of these facts 

 it is believed that the genus Lasiodiplodia should be abolished. 



Identity of Peridermium fusiforme witli P. cerebrum, G. G. Hedgcock and 

 W. H. Long {U. S. Dept. Agr., Jour. Agr. Research, 2 {1914), No. 3, pp. 241-250, 

 pi. 1). — ^As the result of field and cultural studies the authors claim that P. 

 fusiforme and P. cerebrum are both secial stages of the same fungus, Cronartium 

 cerebrum n. comb., and that they are not sufficiently differentiated to constitute 

 separate races. In this connection it is further stated that C. quercus of Europe 

 is not identical with C. cerebrum of the United States. 



Biological strains of Sphaeropsis malorum, L. R. Heslee {Abs. in Phyto- 

 pathology, 4 {1914), No. 1, p. 4-5).— Studies are reported of Sphaeropsis taken 

 from 15 different host plants, cross inoculations being made on a large number 



