39] Stoifumsatz 531 
469. Niklas, H., Scharrer, K. und Strobel, A. Beiträge zur Frage der 
Kohlensäuredüngung. (Landw. Jahrb. 60, 1924, p. 349— 377.) — Ref. in 
Bot. Ctrbl., N. F. 5, 1925, p. 22. 
470. Onken, A. Kritisches und Experimentelles zur Frage 
nach der ernährungsphysiologischen Leistung des Milchsaftes. 
(Bot. Archiv 8, 1923, p. 262—271, 4 Textabb.) — Ref. in Bot. Ctrbl., N.F. 2, 
1923, p. 459—460. 
471. Philipson, €. A study on the influence of the ratio between 
sodium and calcium in a very dilute nutrient solution upon 
the growth of Svalöf’s Dala-oats. (Svensk Bot. Tidskr. 18, 1924, p. 341 
bis 370, 9 Textfig.) — Ref. in Bot. Ctrbl., N. F. 6, 1925, p. 144—145. 
472. Pinekney, R.M. Effect of nitrate application upon the 
hydrocyanic acid content of Sorghum. (Journ. Agric. Research 27, 1924, 
p- 717—723.) — Ref. in Bot. Ctrbl., N. F. 5, 1925, p. 78. 
473. Pinckney, R. M. Sorehum as an indicator of available soil- 
nitrogen. (Soil Science 17, 1924, p.315— 321.) — Ref. in Bot. Ctrbl., N. F. 5, 
12, 105 DE 
474. Politis, J. Sur la formation d’un glucoside (saponarine) 
au sein des mitochondries. (C. R. Acad. Sci. Paris 177, 1923, p. 280 
bis 282.) 
475. Prat, S. The action of different nutrient solution on 
the formation of Volutine. (Sborn. Klubu prirod. Praze 1922, p. 4—6, 
ı Idanto)) 
476. Prianischnikow, D. Zur Frage über die Bedeutung des 
Kalziums für die Pflanzen. (Ber. D. Bot. Ges. 41, 1923, p. 138—144, 
1 Textabb.) — Ref. in Bot. Ctrbl., N. F. 3, 1924, p. 168. 
477. Prianischnikow, D. Sur le röle de l’aspargine dans les trans- 
formations des matieres azotees chez les plantes. (Rev. gen. Bot. 
36, 1924, p. 108—122, 159—181.) — Ref. in Bot. Ctrbl., N.F. 5, 1925, 
p. 405. 
478. Priestley, J.H. The fundamental fat metabolism of the 
plant. (The New Phytologist 23, 1924, p. 1—19.) — Ref. in Bot. Ctrbl., 
N.F. 5, 1925, p. 404. 
479. Pringsheim, H. und Fuchs, W. Über den bakteriellen Abbau 
von Ligninsäure. (Ber. D. Chem. Ges. 56, 1923, p. 2095— 2097.) 
480. Reddish, 6. F. and Rettger, L.F. A morphological, cultural 
and biochemical study of representative sporeforming anaäerobie 
baecteria. (Journ. of Bacteriology 9, 1924, p. 13—58.) — Ref. in Bot. Ctrbl., 
N.F.5, 1925, p. 96—97. 
481. Reed, H. S. and Haas, A.R. C. Some relations between the 
growth and composition of young orange trees and the concen- 
tration of the nutrient solution employed. (Journ. Agrie. Research 
28, 1924, p. 277—284, 1 Taf.) — Ref. in Bot. Ctrbl., N. F. 5, 1925, p. 142. 
482. Reed, H. S. and Haas, A.R.C. The pseudo-antagonism of 
sodium and calcium in dilute solutions. (Journ. Agrie. Research 
21,.1923,,p. 753757, 1 Tat.) — Ref. in Bot. Ctrbl., N. EP. 3, 1924, p.' 359. 
483. Reed, H.S. and Haas, A.R. €. Effect of Sodium Chlorid and 
Caleciumchlorid upon growth and composition of young orange 
trees. (Univ. Calif. Agrie. Techn. Pap. 4, 1923, 32 pp., 6 Taf.) 
