154 PHYSIOLOGY [BoT. Absts., Vol. IX, 



The author was unable to isolate styresinol in a seemingly pure state. The volatile oil 

 (1.5-2.0 per cent) obtained by steam distillation has been identified as styrol, CeHsCH: CHj 

 a phenyl substitution product of ethylene and identical to that obtained from Oriental spe- 

 cies ; it has a boiling point of 145°C., sp. gr. of 0.070, and is dextrorotatory 16° 30". The author 

 was unable to isolate styrogenin, a white amorphous bodj'', reported to be present in styrax. 

 Methods of collection and range of distribution are given, the latter according to the author 

 extending from Connecticut to southeastern Missouri, south to Tampa Bay, Florida, through 

 Arkansas and Oklahoma to Texas, and then south to Mexico. It is stated that the outlook 

 for larger use of American styrax seems encouraging. — Anton Hogstad Jr. 



992. ViEHOEVER, Arno. Report on medicinal plants. Jour. Assoc. Official Agric. Chem. 

 4: 409-415. 1921. — The report concerns itself with new sources of supplies or proper substi- 

 tutes for drugs not now obtainable; value of volume-weight determinations in the analysis 

 of crude drugs and spices; value of micro-sublimation in the analysis of plant products; the 

 condition of domestic and imported drugs. — F. M. Schertz. 



993. Wallis, T. E. Analytical microscopy. Pharm. Jour. 106: 48-50. Fig. 1. 1921.— 

 The concluding paper of this series presents counting methods, illustrated by the Lycopodium 

 spores and the maize starch procedure, and the preparation of crude fiber for counting. — 



E. N. Gathercoal. 



994. WiNTERSTEiN, E., UNO A. Weinhagen. Beitrage zur Kenntnis der Arekaalkaloide : 

 Ueber Guvacin und Isoguvacin. [Areca alkaloids: Guvacin and isoguvacin. Arch, der 

 Pharm. 257: 1-12. 1919. — Chemical isolation of two isomeric bases, C6H9NO2, guvacin and 

 isoguvacin, from the strongly concentrated mother liquid of arecolin. Guvacin is said to 

 be A' tetrahydronicotinic acid. Isoguvacin is possibly a pyrrol derivative. — H. G. Barbour. 



995. Zornig-Basel, H. Beitrage zur Pharmakogeographie. [Pharmaco-geography.] 

 Arch, der Pharm. 257: 129-144. 1919. — An extensive catalogue of commercial products of 

 African and neighboring colonies is presented. Political ownership of these colonies seems 

 to be based on the status in 1913. — H. G. Barbour. 



PHYSIOLOGY 



B. M. DiTGGAR, Editor 

 Carroll W. Dodge, Assistant Editor 



(See also in this issue Entries 599, 610, 634, 686, 694, 700, 794, 801, 815, 817, 824, 866, 871, 

 872, 883, 908, 909, 911, 919, 928, 964, 974, 975, 1068, 1071) 



DIFFUSION, PERMEABILITY, ADSORPTION 



996. Fitting, Hans. Untersuchungen iiber die Aufnahme und iiber anomale osmotische 

 Koeffizienten von Glyzerin und Harnstoff. [Investigations relative to the absorption and the 

 abnormal osmotic coefficients of glycerine and urea.] Jahrb. Wiss. Bot. 59: 1-170. 1919. 



997. Knudson, L., and S. Ginsburg. Suggestions with respect to the measurement of 

 osmotic pressure. Amer. Jour. Bot. 8: 164-170. Fig. 1. 1921. — The osmotic concentration 

 of the leaf cells of Zebrina pendula and Iresine Herbstii was determined both by the cryoscopic 

 and the plasmolytic methods. A piston cylinder for the expression of the cell sap is described. 

 The experiment shows that a pressure of 50,000 lbs. yields a more concentrated sap than 

 does one of 10,000 lbs. The method of freezing the tissue was not found to affect the results 

 greatly. Considerable differences were observed in the osmotic pressure when determined by 

 the plasmolytic and by the cryoscopic methods, the latter giving in every case a higher 

 figure. — E. W. Sinnott. 



