No. 2, September, 19201 PHYSlOLOcv 291 



222"). SlBGidNGER, John B. Temporary roots of the sorghums. Jour. Amer. Soc. Agron. 

 12: 143-145. 1920.— Under greenhouse conditions the radicle is (lie only temporary root de- 

 veloped in sorghums. Shortly after germination the first node develops below the surface 

 and from this node the first permanent roots develop. — F. M. Schertz. 



MOVEMENTS OF GROWTH AND TURGOR CHANGES 



2226. Bbemekamp, C. E. B. Theorie des Phototropismus. [The theory of phototropism.) 

 Recueil Trav. Bot. Neerland. 15: 123-184. Fig. 1 U. 1918. 



2227. Jiv anna Rao, P. S. Noteon the geotropic curvature of the inflorescence in Eichornia 

 speciosa Kunth (water hyacinth). Jour. Indian Bot. 1: 217-218. / fig. 1920. — Bending of 

 the floral axis begins immediately after the flowers close, and results in complete submergence 

 of the inflorescence. The reaction is geotropic rather than hydrotropic. — Winfield Dudgeon. 



GERMINATION, RENEWAL OF ACTIVITY 



2228. Bastin, S. L. Colored glass for seed germination. Sci. Amer. 122: 165. 1 fig. 

 1920. 



2229. Duysen, F. Ueber die Keimkraftdauer einiger landwirtschaf tlich Wichtiger Samen. 

 [The vitality of certain agriculturally important seeds.] Illustrierte Landw. Zeitg. 39: 282-283. 

 1919.— See Bot. Absts. 5, Entry 1132. 



2230. Martin, J. N., and L. E. Yocum. A study of the pollen and pistils of apples in re- 

 lation to the germination of the pollen. Proc. Iowa Acad. Sci. 25:391-410. Fig. 163-166. 1920. 

 —See Bot. Absts. 5, Entry 1759. 



TEMPERATURE RELATIONS 



2231. Bancroft, Wilder D. [Rev. of: Griffeths, Ezer. Methods of measuring tem- 

 perature. 22x17 cm., xi + 174 p. Philadelphia: J. B. Lippincott Company, 1918.] Jour. 

 Phys. Chem. 23 : 2S6-288. 1919. — The review is chiefly concerned with methods for measuring 

 temperatures above the boiling point of water. — H. E. Pulling. 



2232. Bronfenbrenner, J., W. T. Bovie, and Estelle M. Wolff. A simple arrange- 

 ment for measuring the rate of heat penetration during sterilization. [Abstract.] Absts. Bact. 

 3: 6. 1919. — A detailed description of the apparatus, with drawings, will appear in the 

 Journal of Industrial and Engineering Chemistry. — Authors. 



2233. Crocker, William. Optimum temperatures for the after-ripening of seeds. Proc. 

 Assoc. Official Seed Analysts of North America 1919: 46-4S. 1919.— See Bot. Absts. 5, Entry 

 1123. 



2234. Shre ve, Edith Bellamy. The role of temperature in the determination of the trans- 

 piring power of leaves by hygrometric paper. Plant World 22 : 172-180. 1 fig. 1919. — Thermo- 

 electric measurement of the temperature of the cobalt chloride slip used in determining the 

 index of transpiring power in plants shows that the temperature of the slip varies so little 

 from that of the air temperature that the latter may be used in calculating the indices. Simi- 

 larly, in standardizing the cobalt slips over a porous evaporating surface in a small closed 

 room, the air temperature may be used instead of the temperature of the slip without sig- 

 nificant error. — Charles A. Shull. 



RADIANT ENERGY RELATIONS 



2235. Dubois, Raphael. Luminous living creatures. Sci. Amer. Monthly 1: 9 -12. 7 

 fig. 1920. [Translated from Science et la Vie (Paris).] — Devoted mainly to a discussion of 

 luminous animal life; but briefly considers luminous fungi and certain photobacteria. — Chas. 

 H. Otis. 



