114 PHYSIOLOGY [BoT. Absts., Vol. X, 



731. Tate, G. Action of heat and moisture on the activity of Ergot and Extractum Ergotae 

 Liquidum. Pharm. Jour. 106: 485. 1921. — The activity was estimated on the isolated, virgin 

 guinea-pig uterus suspended in 60 cc. of Locke solution at •37°C. Standardized liquid extract 

 heated to 38°C. in an incubator for 25 days showed a loss in activity, and when so heated to 

 50°C. for 12 days the activity was decreased to a considerable extent. Dry ergot heated in a 

 similar way showed no change but moist ergot so heated (mold developed) indicated a slight 

 increase in activity. Whole ergot should be well dried and kept in air-tight containers. Liq- 

 uid extract of ergot should not be stored at a temperature rising at any time above 80°F. — 

 E. N . Gathercoal. 



732. Wallis, T. E. The structure of Cocculus indicus. Pharm. Jour. 106: 306-309. 

 Fig. 1. 1921. — A detailed description, accompanied by well-executed drawings and references 

 to the literature, is given of the anatomy of the fruit, which constitutes the commercial 

 article. — E. N. Gathercoal. 



PHYSIOLOGY 



B. M. DuGGAR, Editor 

 Carroll W. Dodge, Assistant Editor 



(See also in this issue Entries 393, 399, 445, 448, 453, 458, 460, 519, 575, 624, 627, 666, 670, 



713, 790, 791, 793, 855) 



PROTOPLASM, MOTILITY 



733. Anonymous. [Rev. of: Schaeffer, Asa A. Amoeboid movement, vii + 156 p., 

 46illus. Princeton University Press and Oxford Press, 1920.] Sci. Prog. [London] 16: 163-164. 

 1921. 



DIFFUSION, PHYSICO-CHEMICAL RELATIONS 



734. B. [Rev. of: Bechhold, Hans. Die Kolloide in Biologic und Medizin. (Colloids in 

 biology and medicine.) ^nd ed. Th. Steinkopff: Dresden and Leipzig, 1919. Bound, 25 

 marks.] Zeitschr. Phys. Chem. 196: 376-377. 1920. 



735. Bancroft, Wilder D. [Rev. of: Clark, W. Mansfield. The determination of 

 hydrogen ions. 23 X 16 cm., 317 p. Williams and Wilkins Co. : Baltimore, 1920. $5.00 (see Bot. 

 Absts. S, Entry 1448).] Jour. Phys. Chem. 25: 87-88. 1921. 



736. Burton, E. F., and E. Bishop. Coagulation of colloidal solutions by electrolytes: 

 influence of concentration of sol. Jour. Phys. Chem. 24: 701-715. 1920. — The authors reach 

 the following general conclusions from their experiments with copper, arsenious sulphide, 

 and gum mastic in the sol condition: For univalent ions the concentration of ion 

 necessary to produce coagulation increases with decreasing concentration of the colloid; for 

 divalent ions the coagulating concentration of these ions is almost constant and independent 

 of the concentration of the colloid; for trivalent ions the coagulating concentration of the ion 

 varies almost directly with the concentration of the colloid. There are at least 2 properties 

 of the system, colloidal solution plus electrolyte, which influence the coagulating power of 

 any ion; these 2 tend to counteract each other's influence. One dominates the action of uni- 

 valent ions, the other that of trivalent ions, while the 2 influences seem to be somewhat equal- 

 ized for divalent ions. It is suggested that an investigation of the influences of the hitherto 

 ignored, but always present, ion that bears the same charge as the colloid (to an equal or 

 greater degree than the coagulating ion in the case of univalent coagulants, and to a less 

 degree in the case of trivalent coagulants) may greatly advance our knowledge of coagula- 

 tion. — H. E. Pulling. 



737. Casale, Luigi. Applicazione del metodo elettrochimico per la determinazione 

 deir energia acida nei vini. [The application of an electrochemical method to the determination 

 of true acidity in wines.] Staz. Sper. Agrarie Ital. 53: 395-398. 1920. — This is in continua- 



