1920] DISEASES OF PLANTS. 841 



Summer planting of wliite pine on the Michigan State forests, R. Watson 

 (Jour. Forestry, IS (tiKiO), Ao. 6. p/;. G2S, f)2.'i). — Planting experiments conducted 

 on the Higgins Lake State P\trest, Mich., indicate that summer planting of 

 white pine can he carried on in tliat region without serious mortality. 



A study of \vindfall loss of western yellow pine in selection cuttings 

 fifteen to thirty years old, R. H. Weidman {Jour. Forestry, 18 (1920), No. 6, 

 pp. 616-022). — The study reported was conducted on representative plats in and 

 near three National Forests in the Blue Mountain region of eastern Oregon. 



The author concludes that heavy windfall in the first few years following 

 cutting does not pres-age the total destruction of the reserve stand or even 

 endanger the method of cutting. As high a loss as 25 per cent by volume on 

 bad windrisk areas may be expected in the course of 20 years. Of all the wind- 

 throw which occurs over a long period of years, a proportion as great as two- 

 thirds or more usually takes place in the first four or five years immediately 

 after cutting, and the remainder is thrown in rapidly decreasing percentages 

 until about 20 years later when the windfall is so slight as to be negligible. 

 Measured by the heaviest loss encountered, the selection method of cutting is not 

 prohibitive in the yellow pine stands of eastern Oregon. 



Report on some preliminary practical trials relative to a study of al- 

 ternate tapping, G. Vernet (Bui. Afir. Fiist. Sci. Saigon [Cochin China], 2 

 (1920), No. 8, pp. 227-238).— A contribution from the Scientific Institute of 

 Saigon presenting data on preliminary tapping experiments with Hevea trees, 

 conducted during the first four months of 1920. 



Philippine forest production as sources of paper pulp, W. H. Brown and 

 A. F. Fischer, trans, by J. Briant (Bui. Agr.. In.<it. Sci. Saigon \Cochin China], 

 2 (1920), No. 8, pp. 2S8-21,5).—A summary in French of Bulletin 16 of the Philip- 

 pine Bureau of Forestry (E. S. R., 40, p. 745). 



Relation of research to forest management, H. F. Wmss (Jour. Forestry, 

 18 (1920). No. 6, pp. 590-',97).—A paper read before the Madison, Wis., section 

 of the Society of American Foresters on May 10, 1920. in which the author 

 presents illustrations showing tlie importance of research in developing and 

 extending forest industries. 



DISEASES OF PLANTS. 



Mycological contributions, E. Fischer (Mitt. Naturf. GeseU. Bern, 1918, 

 pp. 72-95). — Of the three sections included in this portion of these contribu- 

 tions, one deals with the inheritance of susceptibility of plans to parasitic fungi, 

 and another with parasitic fungi collected in the eastern portion of Java. 



Some new fungi, N. Ranoi6vitch (Bui. Trimest. Soc. Mycol. France, 35 

 (1919), No. 1-2, pp. 14-26, figs. H). — The 17 species here described as new 

 (some being parasitic), represent 13 genera in 7 families. 



Puccinia antirrhini, H. W. Thurston, jr. (Phytopathology. 9 (1919), No. 8, 

 p. 330). — The occurrence of P. antirrhini on snapdragons in the greenhouse of 

 the University of Nebraska is reported, and inquiry is said to have shown that 

 the disease has been present in the State since 191G. In some greenhouses from 

 25 to 50 per cent of the plants have been killed. It is thought the rust was 

 introduced on cuttings from sonie infected region, but efforts to trace it to such 

 source have been unsuccessful. 



The minimum, optimum, and maximum temperatures of spore germina- 

 tion in some Uredinales, W. I.. Doran (Phytopathology, 9 (1919), No. 9. pp. 

 391-402, fig. 1; reprinted as New Hampshire Sta. Sci. Contrib. 14 (1919), pp. 

 S91-402). — A study has been made of the germination of a number of species of 



