No. 1, May, 1921] PHYSIOLOGY 87 



609. Raber, Oran L. A quantitative study of the effect of anions on the permeability of 

 plant cells. Jour. Gen. Physiol. 2:535-539. 1920. — This is a contribution on the influence 

 of anions on permeability as determined by the electrical conductivity method of Osterhgut. 

 The sodium salts of sulfocyanide, chloride, nitrate, acetate, tartrate, phosphate, and citrate 

 were used individually in the first series of experiments in solutions of equal conductivity and 

 in the second series at a concentration of 0.52 m. Comparing the resistance of Laminaria 

 Agardhii after treatment with the individual salt solutions with the resistance of the control 

 in sea water of the same conductivity, it was noted that citrate, phosphate, tartrate, and 

 sulfate caused a marked decrease in resistance, while the bromide, sulfocyanide, chloride, 

 and nitrate were less effective. — L. Knudson. 



MINERAL NUTRIENTS 



610. Can'als, E. Dosage du calcium et du magnesium dans differents milieux salins. 

 [The amounts of calcium and magnesium to be used in different culture media.] Compt. 

 Rend. Acad. Sci. Paris 171 : 516-518. 1920. — It is found that iron salts used in culture solu- 

 tions precipitate some of the calcium and magnesium. In addition, the aluminium salts 

 precipitate some of the magnesium. This precipitation is prevented by adding a few drops of 

 an acid such as acetic. — C. H, Farr. 



611. HoFFER, G. N., AND R. H. Carr. I. Iron accimiulation and mobility in diseased 

 cornstalks. [Abstract.] Phytopath. 10: 56. 1920. 



612. HoFFER, G. N., AND R. H. Carr. II. Experiments to test effects of iron salts on 

 com plants. [Abstract.] Phytopath. 10: 57. 1920. 



613. Pfeiffer, Th., A. Rippel, und Ch. Pfotenhauer. Uber den Verlauf der Nahr- 

 stoffaufnahme und Stofferzeugung bei der Gerstenpflanze. [The course of plant food absorp- 

 tion and assimilation in the barley plant.] Fiihlings Landw. Zeitg. 68: 81-101. Fig. 1-8. 

 1919. — Barley plants were planted April 3 on well fertilized land. Representative samples 

 of the aerial parts were taken April 24, when the third leaf was forming. May 30, before head- 

 ing, June 14, just headed, July 7, in the milk, and July 23 (fully ripe), and total dry matter, 

 ash, organic matter, phosphoric acid, lime, magnesia, potash, nitrogen, and silica deter- 

 mined in each case. Separate determinations were made on the leaves, stems, and heads. 

 The total dry matter increased up to harvest time. All substances in the grain were most 

 abundant at harvest time except lime and potash, which reached maxima during the milk 

 stage. Total ash increased up to the time of the milk stage. The ash content of the 

 leaves and stems was highest respectively at heading time and during the milk stage. Total 

 organic matter increased steadily to harvest time, being highest in the leaves at heading 

 time and in the stems during the milk stage. Total phosphoric acid increased up to harvest 

 time, being highest in the leaves before heading and in the stems at heading time. Total 

 lime increased up to the milk stage, being highest in the leaves at heading time and in the 

 stems during the milk stage. Total magnesia increased up to heading time, but the pro- 

 portion in the stems reached its maximum during the milk stage. Total potash increased up 

 to the milk stage, being highest in the leaves before heading. Total nitrogen increased up 

 to harvest time, being highest in the leaves before heading and in the stems at heading time. 

 Total silica increased up to harvest time, being highest in leaves and stems during the milk 

 stage. — A . T. Wiancko. 



PHOTOSYNTHESIS 



614. CouPiN, Henri. Sur les plantules qui verdissent a I'obscurite. [On seedlings which 

 turn green in the dark.] Compt. Rend. Acad. Sci. Paris 170: 1071-1072. 1920.— A compari- 

 son of seedlings of pines grown in the light with those grown in darkness reveals a difference 

 in the amount of chlorophyll and anthocyan in the cotyledons and hypocotyl. Very little 

 morphological aetiolation occurs in this species. Only one kind of chlorophyll develops in 

 darkness. — C. H. Farr. 



