No. 3, January, 1922] ECOLOGY, PLANT GEOGRAPHY 147 



An account is given of the influence of moisture and light; also of growing habits and spore 

 dissemination, with a list of species in the different localities. — Ernst Gram. 



955. Griggs, R. F. Scientific results of the Katmai Expeditions of the National Geographic 

 Society. I-X. Ohio State Univ. Bull. 241^: 1-192. 126 fig. 1920.— This is a collection of 

 reprints from the Ohio Journal of Science. Among the papers included the following by the 

 author are of botanical interest: The Recovery of Vegetation at Kodiak, Are the Ten Thousand 

 Smokes real Volcanoes, The Character of the Eruption Indicated by its Effects on Nearby 

 Vegetation, and The Beginnings of Revegetation in Katmai Valley. — E. N. Transeau. 



950. Kellerman, Karl F. The effects of salts of boron upon the distribution of desert 

 vegetation. Jour. Washington [D.C.] Acad. Sci. 10: 4S1-48G. 1920.— The distribution of 

 boron compounds in the water and soil of the Pacific Coast is discussed, and the suggestion 

 made that there may be a very close relationship between the presence of these substances and 

 the desert character of certain areas. — Helen M. Gilkey. 



957. Lbs AGE, Pierre. Evaporometresetmouvement des fiuidesautravers des membranes. 

 [Evaporimeters and the movement of liquids through membranes.] Compt. Rend. Acad. 

 Sci. Paris 171: 927-930. 1920. — The author discusses the physical principles involved in the 

 operation of evaporimeters and their relation to the movement of liquids through membranes. 

 — C. H. Farr. 



9.58. Moore, Barrington. The scope of ecology. Ecology 1: 3-5. 1920. — In this, 

 the presidential address, delivered before the St. Louis meeting of the Ecological Society of 

 America, 1919, the synthetic nature of the present problems in ecology is emphasized. — 

 Charles A. Shull. 



959. Powers, Edwin B. The variation of the condition of seawater, especially the hydro- 

 gen-ion concentration, and its relation to marine organisms. Publ. Puget Sound Biol. Sta. 

 2: 369-385. PI. 64. 1920. — The work was done primarily with animals, but affects botany 

 directly in the plankton and indirectly in general principles. It is suggested that the com- 

 patibility of the habitat depends more upon the per cent of hydrogen than upon any other 

 water factor. Fixed forms must withstand a greater range of Ph than plankton or motile 

 forms. — T. C. Frye. 



960. Shreve, Edith B. Seasonal changes in the water relations of desert plants. [Ab- 

 stract.] Ecology 1: 64. 1920. 



961. Varney, B. M. Monthly variations of the precipitation-altitude relation in the central 

 Sierra Nevada of California. Monthly Weather Rev. 48: 648. 2 fig. 1920.— Study of the pre- 

 cipitation data for a series of stations across the central Sierra Nevada of California indicates 

 that the rate of increase of precipitation with altitude varies throughout the year in a well- 

 defined progression from smallest rate in summer to greatest in winter. Similarly, the rates 

 of decrease in the zone above the level of maximum precipitation, and in the zone from the 

 summit down the leeward slope are smallest in midsummer and greatest in midwinter. — 

 It is suggested that the observed seasonal variations are probably the result of seasonal differ- 

 ences in the relative humidity of the air currents involved, and that, if this be true, well 

 marked seasonal variations in the precipitation-altitude relation may be a general character- 

 istic of regions having pronounced wet and dry seasons. — Author's abstract. 



962. Varney, B. M. Some further uses of the climograph. Monthly Weather Rev. 

 48: 495-497. Fig. 0. 1920. 



963. Weaver, J. E., axd A. Mogenssn. Relative transpiration of coniferous and broad- 

 leaved trees in autumn and winter. Bot. Gaz. 68: 393-424. 18 fig. 1919. — A series of green- 

 house and field experiments, with results, are presented in tabulations and discussions. Based 

 on the daily average water loss per unit area of leaf surface, the species rank as follows : Abies 



