23] Stoffaufnahme. Allgemeines 515 
280. Reed, H.S. and Haas, A.R.(C. Some effects of certain 
calecium salts upon the growth and absorption of Citrus seedlings. 
(Amer. Journ. of Bot. 11, 1924, p. 15—18, 2 Tab.) — ,‚Our results indicate 
that Citrus seedlings grown in a calcium chlorid solution will absorb more 
calcium cations than chlorid anions. In the concentrations employed, the 
growth of roots was influenced more by the amount of calcium in solution 
than by the character of the-anion with which the caleium cation was combined 
in the salt used.“ 
281. Sakamura, T. Über die Kultur von Aspergillus niger, mit 
besonderer Berücksichtigung des Puffervermögens der Nähr- 
lösung. (Journ. Coll. Agrie. Hokkaido Imp. Univ. 14, 1924, p. 65—128, 
12 Textkurven.) — Ref. in Bot. Ctrbl., N. F. 6, 1925, p. 147—-148. 
282. Sartoris, @.B. Studies in the life history and physio- 
logy of certain smuts. (Amer. Journ. of Bot. 11, 1924, p. 617—647, 
3 Taf.) — Ref. in Bot. Ctrbl., N. F. 5, 1925, p. 423—424. 
283. Schmidt, E. 6., Peterson, W. H. and Fred, E.B. The destruc- 
tion of Pentosans by molds and other microorganisms. (Soil Science 
15, 1923, p. 479—488.) — Ref. in Bot. Ctrbl., N.F. 3, 1924, p. 301—-302. 
284. Stapp, EC. und Ruschmann, & Zur Biologie von Azotobacter. 
(Arb. Biol. Reichsanst. 13, 1924, p. 305—368, 3 Textfig.) — Ref. in Bot. Ctrbl., 
N.F. 5, 1925, p. 222—223. 
285. Stiles, W. The absorption of salts by storage tissues. 
(Ann. of Bot. 38, 1924, p. 617—633, 4 Textfig.) — Ref. in Bot. Ctrbl., N. F. 5, 
1925, p. 147. 
286. Theron, J. J. Influence of reaction on inter-relations 
between the plant and its culture medium. (Univ. California Publ. 
Asric. Sc. 4, 1924, p. 413—444, 12 Fig.) — Ref. in Bot. Ctrbl., N. F. 5, 1925, 
p. 207—208. 
287. Truffaut, G. et Bezssonoff, N. Influence de la concentration 
en sucre des milieux sur l’activite des bacteries fixatrices 
d’azote. (C. R. Acad. Sei. Paris 177, 1923, p. 649—652.) 
288. Truffaut, G. et Bezssonoff, N. Des Mais se developpent nor- 
malement en n’utilisant que l’azote fixee par des bacteries. (C.R. 
Soc. Biol. 91, 1924, p. 1077—1078.) — Ref. in Bot. Ctrbl., N. F. 5, 1925, p. 208. 
289. Ulehla, V. Jak pusobi vodikove ionty na nektere niZSi 
rostling. [Über den Einfluß der Wasserstoffionen auf einige 
niedere Pflanzen.] (Studia Mendeliana, Brünn 1923, p. 229—253.) 
290. Ulehla, V. and Morävek, V. On a new method of stating the 
physiological identity. (Vestnik J. sjezdu deskoslov. bot. Praze 1923, 
pP. 45 47.) — Ref. in Bot. Ctrbl., N.F. 3, 1924, p. 101. 
291. Uspenski, E.E. Contributions to the study of the action 
of different quantities of iron. (Transact. Inst. on Fertilizers Moskau 
23, 1924, p. 1—32. Russisch mit englischer Zusammenfassung.) — Ref. in 
Bot. Ctrbl., N. F. 5, 1925, p. 401. 
292. Wiley, R.C. and Gordon, N.E. Availability of adsorbed 
Phosphorus. (Soil Science 15, 1923, p. 371—273, 1 Taf.) — Ref. in Bot. 
Ctrbl., N. F. 3, 1924, p. 301. 
293. Withycombe, ©. L. On the function of the bladders in 
Utricularia vulgaris L. (Journ. Linn. Soc. Bot. 46, 1924, p. 401—413, 11 Fig.) 
— Ref. in Bot. Ctrbl., N. F. 5, 1925, p. 264. 
