1919] DISEASES OF PLANTS. 641 



to lookout stations In locating forest fires. The special alidade used In drawing 

 the panorama section is also described. 



Use of airplanes in forest patrol work. II. S. GRATIS {Aviation and Aero- 

 naut, llnijin., 5 (19 ID), No. 12, pp. 75-}, 755). — A short discussion relative to the 

 possibilities of adapting airplanes to assist in Are detection and control. 



Descriptive list of forest trees and ornamental shrubs grown at the Gov- 

 ernment forest nursery. Salisbury [Rhodesia] (Rhodesia Agr, .lour.. 16 

 (1D1D), No. 1, pp. J,5-53). — The data presented In this list include common 

 and botanical names and brief remarks on the distinguishing characteristics 

 of the various trees and shrubs. 



Sugar as a coagulant for Hevea latex, R. D. Anstead (Planters' Chron., 1$ 

 {1918), So. 32, pp. ■',.'.'. 529; Agr. Jour. India, i>, (1919), So. 1, pp. 171-17.',).— 

 A brief review of the literature dealing with the use of sugar as a coagulant 

 for Hevea latex. 



The possibilities of farm woodland development under the Smith-Lever 

 Act. c. It. Tillotson (Amer. Forestry, 25 (1919), Wo. 301, pp. 785-787, figs. 

 .',). — In this paper the author calls attention to the importance of the farm 

 woodlands as sources of fire wood, posts, poles, etc, and indicates how farm 

 woodland production can be stimulated by the use of extension agencies 

 developed under the Smith-Lever Act. 



The use of wood for fuel (U. 8. l>ci>t. Agr. Bui. 753 (191D), pp. 1,0, pis. 5, 

 fi</x. 2). — This is largely a compilation of information from many sources pre- 

 pared with special reference to aiding in the conservation of the Nation's coal 

 supply. It discusses the present use and supply of fuel wood, what to use for 

 wood fuel, producing and marketing wood fuel, how to use wood fuel, efficiency 

 of wood fuel, the production of wood fuel for the future, and methods of 

 promoting its use. Appended to the bulletin are recent publications on wood 

 fuel and a general bibliography on the subject. 



Pulp and paper investigations of the Forest Products Laboratory in 1918, 

 V. P. Kdwardks [Paper Trade Jour., 68 (1919), No. 6, pp. 128, 12',).— A descrip- 

 tive account of the pulp and paper investigations, conducted largely to de- 

 termine the various uses to which paper could be put for war purposes. 



Pulp mills of the United States, EL E. SlT&FACB and F. H. Smith (Paper 

 Trade Jour., 68 (1919), No. 6, pp. 109, 111, 113, 115, 121, flgs. 4).— Statistical 

 data and maps prepared under the direction of the Forest Service of the U. S. 

 Department of Agriculture are given, showing the locations and relative capaci- 

 ties of the ground wood, sulphite, sulphate, and soda pulp mills in the country. 



DISEASES OF PLANTS. 



Effect of certain ecological factors on the morphology of the urediniospores 

 of Puccinia graminis, E. C. Stakman and M. N. I. i:\ink (Jour. Agr. Research 

 [U. S.I, 16 (1919), No. 2, pp. 43-77).— In studies carried on cooperatively be- 

 tween the Minnesota Experiment Station and the V. S. Department of Agri- 

 culture with several biologic races of l'. graminis, the authors Investigated the 

 quantity of inoculum to be used, optimum length of incubation, condition of 

 urediniospores necessary to insure uniform measurements, number of measure- 

 ments to be made of a given strain, and method of computation employed, as 

 affecting the morphology of the urediniospores. 



The amount of spore material used for inoculation was found to have no per- 

 ceptible effect on the result of infection or size of spores, except in so far as a 

 more extensive area of and a greater certainty for successful infection may 

 be secured. The optimum length of the incubation period in the moist chamber 



