No. 2, June, 1921] ECOLOGY, PLANT GEOGRAPHY 135 



934. Fuller, George D. Vegetation of a glacial plunge basin. [Rev. of: Petry, Loren 

 C. Studies of the vegetation of New York State. II. The vegetation of a glacial plunge basin 

 and its relation to temperature. Bull. Torrey Bot. Club 45: 203-210. 1918 (see Bot. Absta. 

 1, Entry835).] Bot. Gaz. 67: 184. 1919. 



935. Gain, Edmond, et Andre Gain. Differences thermique de I'ubac k I'adret d'une 

 vallee lacustre. [Temperature differences between the shaded slope and the sunny slope of a 

 lacustrine valley.] Compt. Rend. Acad. Sci. Paris 170: 191-194. 1920.— The water of the 

 lake is found at times to have a temperature at its surface of 4-6°C. higher than the soil on 

 the adjacent slopes. The temperature of the soil at 1 dm. beneath the surface on the northern 

 sunny slope is usually about 1°C. higher than that of the southern shaded slope. A like 

 difference is found in the water of the streams entering the lake from the two slopes respec- 

 tively.— C. H. and W. K. Farr. 



936. Gray, John, and George J. Peirce. The influence of light upon the action of sto- 

 mata and its relation to the transpiration of certain grains. Amer. Jour. Bot. 6: 131-155. 18 



fig. 1919.— See Bot. Absts. 3, Entry 43G. 



937. Johnston, Earl S. Climatic conditions in a greenhouse as measured by plant 

 growth. [The author's abstract of a paper read before the American Meterological Society, 

 April 22, 1920.] Monthly Weather Rev. 48:215. 1920. 



938. Keen, B. A. Forecasting frosts. Nature 104: 450-451. 1920. — Review of obser- 

 vations by Boussingault, Hellman, Schubert, J. Warren Smith, Hazen, O'Gara, and 

 T. B. Franklin. "Up to the present no complete correlation has been made of frost in any 

 particular locality and its causes. For this purpose an examination by statistical methods 

 of a series of continuous observations (of the automatic recording type) of metereorological 

 factors is needed." — 0. A. Stevens. 



939. Michael, Ellis L. Marine ecology and the coefficient of association: a plea in behalf 

 of quantitative biology. Jour. Ecol. 8: 54-59. 1920. — The writer examines the various for- 

 mulae used for deriving the coefficients of association as applied to plankton studies and 

 finds them all deficient. Emphasizing the importance of quantitative results he demands 

 that proficiency in mathematics be regarded as a prerequisite for major work in biology. — 

 Geo. D. Fuller. 



940. Shull, Charles A. Correlation of wind flow and temperature with evaporation. 

 Plant World 22: 210-215. Fig. 1919.— Statistical study of the data obtained from evapora- 

 tion station records from Lawrence, Kansas, shows that the correlation between air movement 

 and evaporation is 0.29 =*= 0.027, and between temperature and evaporation the correlation 

 is 0.687 ± 0.015d.— Charles A. Shull. 



STRUCTURE AND BEHAVIOR 



941. Crocker, William. Buried weed seeds. [Rev. of: Brenchley, Winifred E. 

 Buried weed seeds. Jour. Agric. Sci. 9: 1-31. 1918 (see Bot. Absts. 2, Entry 615).] Bot. 

 Gaz. 67: 515-516. 1919. — The reviewer regards the author's conclusions justified, but records 

 her failure to note the very similar studies and conclusions of Peter, Beal, and Duvel. — 

 H. C. Cowles. 



942. Crocker, William. Osmotic pressure of epiphytes. [Rev. of : Harris, J. Arthur. 

 On the osmotic concentration of the tissue fluids of phanerogamic epiphytes. Amer. Jour. 

 Bot. 5:490-506. 1918 (see Bot. Absts. 1, Entry 829; 8, Entry 944).] Bot. Gaz. 67: 520. 1919. 



943. Douglass, A. E. Climatic cycles and tree growth: a study of the annual rings of 

 trees in relation to climate and solar activity. Carnegie Inst. Washington Publ. 289. 127 p., 

 pi. 1-12, fig. 1-40. 1919. — Measurements and dates of formation of the annual rings of 230 



