No. 2, November, 19201 PHYSIOLOGY 125 



870. Gain, Edmosd, and Andre Gain. Conditions thermiques du sol sous l'influence 

 de la vegetation locale. [Thermal conditions of the soil under the influence of local vegetation.] 

 Rev. G6n. Bot. 32: 101-164. 1920.— See Bot. Absts. 6, Entry 299. 



RADIANT ENERGY RELATIONS 



871. Denis, Marcel. L'optimum lumineux pour la developpement du Stichococcus bacil- 

 laris Nag. [Optimum light for Stichococcus bacillaris Nag.] Rev. G6n. Bot. 32: 72-77. 1920. 

 — Pure culture of Stichococcus bacillaris produced the greatest dry weight of growth in Det- 

 mers' nutrient solution when exposed to rather weak illumination. In direct sunlight 

 the cells were yellow-green and more or less spherical. In tap water initial development was 

 possible in all light-intensities tried, but continued growth was prevented by the inability 

 to fix free nitrogen. — F. B. Wann. 



872. Eberson, Frederick. Ultraviolet rays and their effect on antigenic properties. I. 

 Ultraviolet light and meningococci. [Abstract.] Absts. Bact. 4: 21-22. 1920. 



MISCELLANEOUS 



873. Cheplin, Harry A., and Leo F. Rettger. Studies on the transformation of the 

 intestinal flora. [Abstract.] Absts. Bact. 4: 8. 1920. 



874. Clark, Mansfield. Reduction potential in its relation to bacteriology. [Abstract.] 

 Absts. Bact. 4:2. 1920. 



875. Koketsu, Riichiro. Time records for physiology, ecology, and climatology. Bot. 

 Mag. Tokyo 34: 13-14. 1920. — Since physiological processes are related to actual solar time, 

 the author suggests that records expressed in the ordinary standard time are not properly 

 comparable. He suggests their translation into solar time for publication, the more particu- 

 larly so that many countries have now adopted the custom of changing their clocks in conform- 

 ity with the so-called daylight-saving laws. — Leonas L. Burlingame. 



876. Kopeloff, Nicholas, and Lillian Kopeloff. Biological factors in sugar-deteri- 

 oration. [Abstract.] Absts. Bact. 4: 7. 1920. 



877. Rogers, L. A., and C. L. McArthur. Variation in the colon count in Potomac river 

 water. [Abstract.] Absts. Bact. 3: 1. 1919. 



878. Rogers, L. A. An improved apparatus for drying cultures by the freezing method. 

 [Abstract.] Absts. Bact. 3: 6. 1919. 





