316 PHYSIOLOGY [Box. Absts., Vol. VII, 



mitted effect of photic stimulation (assisted by J. Sircar), xxxiv. — On photonastic curva- 

 tures (assisted by G. Das), xxxv. — Effect of temperature on phototropic curvature (assisted 

 by G. Das), xxxvi. — On phototropic torsion (assisted by S. C. Das), xxxvii. — Radio- 

 thermotropism (assisted by G. Das), xxxviii. — Response of plants to wireless stimulation 

 (assisted by G. Das), xxxix. — Geotropism. xl. — Geo-electric response of shoot (assisted by 

 S. C. Guha). xli. — The mechanical and electrical response of root to various stimuli, xlii. — 

 Geo-electric response of root (assisted by S. C. Guha). xliii. — Localization of geo-perceptive 

 layer by means of the electric probe (assisted by S. C. Guha). xliv. — On geotropic torsion 

 (assisted by G. Das), xlv. — On thermo-geotropism. xlvi. — Diurnal movements in plants, 

 xlvii. — Diurnal movement due to alternation of light and darkness (assisted by L. M. Muk- 

 HERJi). xlviii. — Diurnal movement due to variation of temperature affecting growth 

 (assisted by L. M. Mukerjee). xlix. — Daily movement in plants due to thermo-geotropism 

 (assisted by L. M. Mukherji). 1. — The after-effect of light (assisted by S. C. Das), li. — 

 The diurnal movement of the leaf of Mimosa. — F. S. Wolpert. 



2165. Massart, J. Recherches sur les organismes inferieurs. VII. Les reflexes chez les 

 Polyporees. [Reactions in the Polyporaceae.] Acad. Roy. Belgique Bull. CI. Sci. 1920: 82-90. 

 10 fig. 1920. — In the Polyporaceae one may recognize the reactions due to 3 causal stimuli 

 as follows: (1) Light which intervenes in the production of the fruit body; (2) gravity in 

 response to which the fungus differentiates its fruit body and orients the tubes of the 

 hymenophore; and (3) contact which inhibits the growth of the hyphae. — Henri Micheels. 



2166. RicoME, H. Sur des phenomenes de torsion comparables a I'enroulement des 

 vrilles provoques experimentalement. [The phenomena of torsion experimentally stimulated 

 and comparable to the curling of tendrils.] Compt. Rend. Acad. Sci. Paris 170: 1399-1401. 

 1920. — Bean stems horizontally placed and fixed by two pins in the region of growth display 

 a torsion between these pins of 180° in 24 hours. It occurs in darkness as well as light, but 

 may be brought about by heliotropic instead of geotropic stimulation. It occurs in detached 

 stems and also does not seem to be related to the distribution of nodes and internodes. — 

 C. H. Farr. 



TEMPERATURE RELATIONS 



2167. BiGELOw, W. D., AND J. R. EsTY. The thermal death point in relation to time of 

 typical thermophilic organisms. Jour. Infect. Diseases 27: 602-617. 1920. — A method is pre- 

 sented for determining the length of time, at different temperatures, necessary to completely 

 destroy a definite known concentration of spores in a medium of known hydrogen-ion concen- 

 tration. The time necessary decreases as the temperature increases and as the Ph value is 

 increased; at a given reaction and temperature, the larger the number of spores present in the 

 medium the longer is the time necessary to destroy them. — Selman A. Waksman. 



RADIANT ENERGY RELATIONS 



2168. Anonymous. Putting plants on daylight rations. Sci. Amer. 122 : 624, 634. 4 fig- 

 1920. — There is described a recent discovery by W. W. Garner and H. A. Allard. [Effect of 

 the relative length of day and night and other factors of the environment on growth and repro- 

 duction in plants. Jour. Agric. Res. 18: 553-605. PI. 64-79, 35 fig. 1920.— See Bot. Absts. 

 5, Entry 22] showing that too many hours of daylight in comparison with the number of 

 hours of darkness will prevent many kinds of plants from flowering and fruiting. — Chas. H. 

 Otis. 



2169. Massart, J. L'action de la lumiere continue sur la structure des feuilles. [The 

 action of continuous light on the structure of leaves.] Acad. Roy. Belgique Bull. CI. Sci. 1920: 

 37-43. 1920. — The author repeated the experiments of Bonnier but with results contradic- 

 tory to those of the latter. — For each species the author proceeded as follows: there were six 

 lots of plants, entirely comparable, which were exposed respectively, (1) to continuous light; 

 (2) to darkness; (3) to light during 12 hours and to darkness during 12 hours (one lot was 



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