216 PHYSIOLOGY [BoT. Absts., Vol. VIII, 



GROWTH, DEVELOPMENT, REPRODUCTION 



1493. Salisbury, E. J. [Rev. of : MacDougal, D. T. Hydration and growth. Carnegie 

 Inst. Washington Publ. 297. vi + 176 p., 52 fig. 1920 (see Bot. Absts. 5, Entry 2223).] Sci. 

 Prog. [London] 15: 319. 1920. 



MOVEMENTS OF GROWTH AND TURGOR CHANGES 



1494. Hendricks, H. V. Torsion studies in twining plants. Bot. Gaz. 68:425-440. 

 6 fig. 1919. — These studies were made on Phaseolus multiflorus and Tiniaria Convolvulus 

 with a modified form of auxanometer, the latter being so arranged that the growing inter- 

 nodes were stretched vertically in order to eliminate twining. An estimate of torsional 

 rigidity at different lengths was made, and studies were begun on antidromous torsion. As 

 the internode begins to elongate it twists but little, but later it twists more rapidly; eventu- 

 ally there is a slight reverse twist. Rigidity or resistance to twisting increases but slowly 

 until nearly the end of the period of elongation, when there is a sudden increase. The final 

 increase in rigidity accompanies lignification. — H. C. Cowles. 



1495. MoBius, M. Die Pflanze und die Schwerkraft. [The plant and gravity.] Ber. 

 Senckenberg. Naturf. Ges. Frankfurt a. M. 47: 78-79. 1919. — In this report of a lecture on 

 geotropic phenomena the contrast is brought out between the uniformity of the actual 

 sensory organs and the diversity of the responses. — A. W. Evans. 



GERMINATION, RENEWAL OF ACTIVITY 



1496. Crocker, William. After-ripening and germination of rice. [Rev. of: Kondo, 

 MoNTARO. Ueber Nachreife und Keimung verschieden reifer Reiskorner. Ber. Ohara Inst. 

 Landw. Forsch. 1: 361-387. 1919 (see Bot. Absts. 3, Entry 2805).] Bot. Gaz. 68: 484. 1919. 



1497. Thiel, a. F., and Freeman Weiss. The effect of citric acid on the germination of 

 the teliospores of Puccinia graminis tritici. Phytopath. 10:448-452. 1 fig. 1920. — Means 

 were sought for shortening the rest period of Puccinia graminis Tritici teliospores. Soaking 

 in 1 per cent citric acid hastened after-ripening so that germination occurred in December, 

 January, and February. Spores treated the optimum time (15 minutes) produced sporidia 

 capable of infection. — E. K. Seymour. 



1498. West, Cyril. Plant physiology. Sci. Prog. [London] 15:34-39. 1920.— This 

 paper contains a brief review of the more recent literature on dormancy, or delayed germi- 

 nation of seeds. — J. L. Weimer. 



TEMPERATURE RELATIONS 



1499. Anonymous. The effect of high temperatures on fruits. Sci. Amer. Monthly 2: 

 272. 1920. — This is a summary of the results of Overholser and Taylor, as set forth in 

 their article in the Bot. Gaz. 69: 274-296. 1920.— Chas. H. Otis. 



1500. Livingston, B. E., and H. S. Fawcett. A battery of chambers with different 

 automatically maintained temperatures. Phytopath. 10: 336-340. 1920. — The water is elec- 

 trically thermostated at the extremes, the intermediate chambers assuming temperatures 

 determined by the temperature-gradient that exists between the 2 ends. — James Johnson. 



RADIANT ENERGY RELATIONS 



1501. Anonymous. Plant movement and radiant energy. Sci. Amer. 123: 631. 1920. 



1502. Pringsheim, E. G. Vom Lichtsinn der Pflanzen. [Light perception by plants.] 

 Ber. Senckenberg. Naturf, Ges. Frankfurt a. M. 47: 57-58. 1919.— A synopsis of a lecture 



