No. 3, July, 1921] PHYSIOLOGY 315 



minor parts in determining the reaction of the solutions. The variations in plant growth 

 secured in these solutions cannot be correlated with differences in hydrogen-ion concentra- 

 tion. — W. J. Bobbins. 



2150. Take, Br. Die Entwicklung der Wurzein und der Kalkgehalt des Bodens. [The 

 development of roots and the lime content of the soil.] Fiihling's Landw. Zeitg. 69: 58-59. 

 1920. — This note calls attention to the fact that investigations on the subject discussed by 

 Oswald in his article "Untersuchungen iiber die Einwirkung des Grundwasserstandes auf 

 die Bewurzelung von Wiesenpflanzen auf Moorboden" published in this journal in 1919 (see 

 Bot. Absts. 7, Entry 638) had been carried on some 20 years ago at the Moor Experiment Sta- 

 tion at Bremen, the last mentioned results showing that root penetration is limited by the 

 depth to which the soil is free of acidity. — A. T. Wiancko. 



PHOTOSYNTHESIS 



2151. Maz:6, p. Recherches sur I'assimilation du gaz carbonique paries plantes vertes. 

 [Investigations on the assimilation of carbon dioxide by green plants.] Compt. Rend. Acad. 

 Sci. Paris 171: 1391-1393. 1920. — This is an attempt to give an experimental basis to the 

 hypothesis of Bayer and Berthelot regarding the steps in the synthesis of sugar. Reactions 

 were secured for the following substances in leaves during assimilation: acetylmethylcar- 

 binol, hydrocyanic acid, glycolic aldehyde, and lactic aldehyde. — Mrs. W. K. Farr. 



2152. WuRMSER, Ren]6, et Mme. J. DucLAUX. Sur la photosynthese chez les algues 

 Floridees. [On the photosynthesis in red algae.] Compt. Rend. Acad. Sci. Paris 171: 1231- 

 1233. 1920. — Chondrus crispus and Rhodymenia palmata were studied in a comparison of the 

 rate of photosynthesis in green and red specimens of the same species. It was found that 

 the red individuals are photosynthetically more active with a given amount of light. An 

 analysis shows that the red individuals contain more chlorophyll than the green, while the 

 lipochromes (xanthophyll and carotin) are present in about equal amounts. — C. H. Farr. 



METABOLISM (GENERAL) 



2153. Anonymous. [Rev. of: Onslow, M. W. Practical plant biochemistry, m + 

 178 p. Cambridge Univ. Press: Cambridge 1920 (see Bot. Absts. 8, Entry 602).] Sci. Prog. 

 [London] 15:498-499. 1921. 



2154. Anonymous. [Rev. of: Rideal, S., and associates. The carbohydrates and 

 alcohol. XV + ^16 p., 11 fig. Bailli^re, Tindall & Cox: London, 1920.] Sci. Prog. [London] 

 15:493-^94. 1921. 



2155. Baker, J.L., andH. F.E.Halton. The iodimetric estimation of sugars. Biochem. 

 Jour. 14: 754-756. 1920. — In general, the writers concur with Judd (see Bot. Absts. 7, Entry 

 1312) in her favorable report of the Wilstatter and Schxjdel iodimetric sugar method and 

 suggest certain modifications in technique. — A. R. Davis. 



2156. Courtonne, H. De Taction contraire des chlorures et des sulfates solubles surle 

 matieres axnylacees. [On the opposite action of soluble chlorides and sulphates on starchy sub- 

 stances.] Compt. Rend. Acad. Sci. Paris 171: 1168-1170. 1920. — Chlorides change starch 

 into amylopectin at ordinary temperatures and into soluble starch atll5°C. No swelling of 

 starch occurred at 115°C. in a mixture of 65 parts MgSO^, 40 parts of water, and 30 parts of 

 starch. — C. H. Farr. 



2157. Coward, Katherine Hope, and Jack Cecil Drummond. Researches on the 

 fat-soluble accessory substance. IV. Nuts as a source of vitamin A. Biochem. Jour. 14: 

 665-667. 1920. — This investigation concerns a rat-feeding experiment in which Brazil, Bar- 

 celona, pea, walnut, almond, and butternuts were supplied as a source of vitamin A. These, 

 although rich in fats, have low vitamin A values. This is additional evidence according to 



