17] Stoffaufnahme. 373 



trations up to 1,()()() p. p. m. does not affect the absorption of phosphorio 

 acid but decreases slightly the absorption of potash. — Sodium sulphate in 

 concentrations of 1.000 p. p. m. depresses tlie absorption of potash and 

 phosphorio acid to approximately 70 per cent of that of the control cultures, 

 expressed in percentage of drv weight of the plants. — Sodium carbonate 

 in concentrations of 1.000 p. p. m. reduces the absorption of potash to 20 per 

 cent of that of the control and the absorption of phosphorio acid to 30 per 

 cent of that of the control. The depressing effect of sodium carbonate is in 

 evidence in concentrations, as low as 100 p. p. m., and is marked in concen- 

 tration of 300 p. p. m. — The relative effect of sodium sulphate and sodium 

 chlorid in depressing the absorption of potash is directionally the same as the 

 relative hydrolysis resulting from the reaction of the two salts with the calcium 

 carbonate present in the cidture Solution. This suggests that the observed 

 effects in the case of sodium sulphate and sodium chloride may be due in 

 part to the accumulafcive action of the slight amoants of sodium carbonate 

 formed in this reaction." 



206. Brenchley, W. E. The effect of the concentration of the 

 nutrient on the growth of barley and wheat in water cultures. 

 (Ann. of Bot. XXX. 1916, p. 77-90.) - Ref. in Bot. Centrbl. CXXXII, 

 1916, p. 57. 



207. Brenner, W. Nachtrag zur ,, Stickstoff nahrung der 

 Schimmelpilze". (Centrbl. Bakt., IL Abt., XXIV, 1915, p. 305.) - Ref. 

 in Bot. Centrbl. CXXXII, 1916, p. 377. 



208. Brenner, W. Züchtungsversuche einiger im Schlamm 

 lebender Bakterien auf selenhaltigem Nährboden. (Jahrb. wiss. 

 Bot. LVII, 1916, p. 95-127.) - Ref. in Bot. Centrbl. CXXXIV, 1917, p. 72. 



209. Brooks, S. C. New determinations of permeability. (Proc. 

 Nat. Acad. of Sc. II. 1916, p. 569-574.) - Ref. in Bot. Centrbl. CXL. 1919, 

 p. 132. 



210. Brown, A. J. and Tiiiker, F. The rate of absorption of 

 various phenolic Solutions by seeds of Hordenm vulgare and the 

 factors governing the rate of diffusion of aqueous Solutions 

 across semipermeable membranes. (Pröc. Roy. Soc. London LXXXIX, 

 B. 1915, p. 119-135.) - Ref. in Bot. Centrbl. CXXXV, 1917. p. 313. 



211. Brown, Adrian J. and Tinker, Frank. Selective permeability: 

 The absorption of phenol and other Solutions by the seeds of 

 Hordeum vulgare. (Proc. R. Soc, B, LXXXIX, 1916, p. 373-380.) - Ref. 

 in Centrbl. Biochem. Biophysik XIX, 1918, p. 683-684. 



212. Burlison, W. L. Availability of mineral phosphates for 

 plant nutrition. (Journ. Agric. Research. VI, 1916, p. 485 — 514.) — Ref. 

 in Bot. Centrbl. CXXXVII. 1918, p. 353-354. 



213. Canipanile, Giulia. Ricerche intorno ai nitrati della Sulla 

 {Hedysarum coronarium) e di altre Leguminose. (Ann. di Bot. XIV, 1916, 

 p. 49-75.) 



214. Ciamiclan, G. et Ravenua, C. Action de quelques sub- 

 stances organiques sur les vegetaux. (Ann. de Chim. 9. III, 1915, 

 p. 5-27.) 



215. Clement, H. Nepenthes et digestion? (Ann. Soc. Linn. 

 Lyon LXII. 1916, p. 11-14.) 



