204 PHYSIOLOGY [BoT. Absts., Vol. VII, 



1375. MoNTEMARTiNi, LuiGi. Nuove osservazioni sopra I'azione eccitante del sulfate di 

 rame suUe piante. [The stimulating action of copper sulfate on plants.] Rev. Patol. Veg. 10: 

 3&-40. 1920. — Tests were made by spraying one side of a plant and leaving the other un- 

 sprayed. When half of the leaves were treated in the morning with a dilute copper sulphate 

 solution and removed in the evening, measured, and the dry weight determined, it was found 

 that the treated leaves had a greater dry weight per unit area. When the leaves were treated 

 at night and removed in the morning, they had a lower dry weight per unit area. This indi- 

 cates that the treatment stimulated the formation and translocation of organic matter. — 

 F. M. Blodgett. 



1376. Nemec, Antoine, and Francois Stranak. Contribution a I'etude de I'influence 

 toxique des terpenes a I'egard de quelques vegetaux superieurs. [The toxic action of terpenes 

 on higher plants.] Rev. Gen. Bot. 32: 241-246. 1920. — Seedlings of Vicia Faba, Zea Mays, 

 and Lupinus Luteus were grown on Knop's solution in cylinders of twenty liters capacity. 

 The terpenes used were menthol, terpineal, pinene and borneal. — When etiolated seedlings of 

 Vicia Faba were exposed to the action of the terpenes, black spots appeared on the surface 

 of the leaves which later became more prominent. Then the stem turned gray and finally 

 black. A "mucous" appears on the stem which has an acid reaction. The plant finally loses 

 turgor and wilts. The ramification of the roots are checked. — Internally the blackening is 

 localized in different regions, as in the cambium. In the root the effect of the vapors occurs 

 first in the recently formed positions of the vascular tissue, and later the remainder is affected. 

 Finally the root forms a tissue (calyphogene) which acts as a protecting layer against the 

 vapors of the terpenes. — The plants experimented with show different degrees of resistance 

 to the vapors of the terpenes. — J. M. Brannon. 



1377. Perry, Margaret C, and G. D. Beal. The quantities of preservatives necessary 

 to inhibit and prevent alcoholic fermentation and the growth of molds. Jour. Indust. Eng. 

 Chem. 12 : 253-257. 1920. — Aspergillus Sydowi, Aspergillus niger, and Penicilliuyn expansum 

 in the order named, effected the greatest deterioration in both molasses and sugar. There 

 is also evidence that an increase in inoculum is responsible for an increase in inversion at a 

 definite concentration. — Henry Schmitz. 



1378. Rusk, Hester M. The effect of zinc sulphate on protoplasmic streaming. Bull. 

 Torrey Bot. Club 47: 425-431. 3 fig. 1920. — Since metallic poisons in minimal doses stimu- 

 late metabolic activity in plants, it was thought that ocular evidence of excitation might 

 be observed in individual cells. Zinc sulphate was used and its effect on rate of streaming 

 was noted in Elodea and in Chara. Acceleration was evident in both plants, Elodea being 

 more sensitive than Chara, but with a less maximum acceleration. — P. A. Munz, 



PHYSIOLOGY OF DISEASE 



1379. Harvey, R. B. Hydrogen-ion changes in the mosaic disease of tobacco plants and 

 their relation to catalase. Jour. Biol. Chem. 42 : 397-400. 1920. — The H-ion concentration of 

 juice expressed from mosaic tobacco leaves was found to be somewhat greater than that 

 from healthy plants. Catalase activity in the mosaic leaves is decreased with increasing 

 hydrogen-ion concentration. — G. B. Rigg. 



MISCELLANEOUS 



1380. Bradford, Samuel Clement. On the theory of gels. II. The crystallization of 

 gelatin. Biochem. Jour. 14: 91-93. 1920. 



1381. Krogh, August. The calibration, accuracy and use of gas meters. Biochem. Jour. 

 14: 282-289. 2 fig. 1920. — This article refers to gas meters employed in physiological 

 research. — A. R. Davis. 



