Neue Litteratur. 67 



Baldwin, E. E. 1909. Reproduction in Apios tuberosa. (Amer. Bot. 

 XV. p. 70—71). [Comments upon the fact that A. tuberosa aban- 

 dons the bearing of seed in colder regions, reproducing by tubers 

 alone. — Trelease.] 



Bruschi, D. 1909. Contributo allo studio fisiologico del latice. (Ann. 

 di Bot. VII. p. 671-701.) 



Clute, W. N. 1909. Experiments with seeds and seedlings. (Amer. 

 Bot. XV. p. 35 — 38). [A criticism of some of the experiments with 

 seeds and seedlings ordinarily given in high-school courses, and 

 a brief reference to the important physiological points which 

 should be emphasized. — Trelease.] 



Cowles, H. C. 1909. The response of plants to soil and climate: in 

 R. D. Salisbury, Physiography forHigh Schools. 1908. p. 462—473.) 



Crocker, W. M. and L. I. Knight. 1909. Effect of illuminating 

 gas and its constituents upon flowering carnations. (Plant World. 

 XII. p. 83—88. fig. 2—4.) 



Dandeno, J. B. 1909. Osmotic theories with special reference to 

 van 'tHoff's law. (Bull. Torrey bot. Club. XXXVI. p. 283—298.) 



Gager, C. S. 1909. Radioactivity and life. (Torreya VIII. p. 277—284.) 

 [A reprint of Chapter V of the author's memoir on „Effects of 

 the Rays of Radium on Plants" in: Mem. N. Y. bot. Garden. IV. 

 Dec. 1908. — Trelease.] 



Gager, C. S. 1909. The influence of radium rays on a few life 

 processes of plants. (Pop. Sc. Monthly. LXXIV. p. 222—232. fig. 2-13), 

 [A populär account of various experiments indicating that radium 

 rays act as a Stimulus to the various physiological processes of 

 plants. — Trelease.] 



Gräfe, V. 1909. Untersuchungen über die Aufnahme von stick- 

 stoffhaltigen organischen Substanzen durch die Wurzeln von Pha- 

 nerogamen bei Ausschluss von Kohlensäure. (Anz. kais. Ak. Wiss. 

 Wien. 1909. 18. p. 291-292.) 



Guthrie, F. B. and L. Cohen. 1909. Note on the occurrence ot 

 manganese in soil and its effect on grass and other crops. (Abstr. 

 Proc. R. Soc. N. S. Wales. Oct. 1909. p. VIII— IX.) 



Kniep, H. und F. Minder. 1909. Ueber den Einfluss verschieden- 

 farbigen Lichtes auf die Kohlensäureassimilation. (Zschr. f. Bot. 

 I. p. 619.) 



Kwisda, A. 1909. Ueber Kolloide. (Zeitschr. des allgem. österr. 

 Apotheker Ver. XL VII. 1909. 19. p. 217—218.) 



Le Gendre, Ch. 1908. Au sujet de l'appetence chimique de l'He- 

 lianthemum vulgare Gaertn. (Bull. Soc. bot. France. 4. VIII. 

 p. 248-252.) 



Livingston, B. E. 1909. An advance in root physiology. (Plant 

 World. XII. p. 127—130). [Points out the need of a new hypothesis 

 which will explain or aid in the investigation of the properties of 

 unproductive soils, on the one hand, and the effects of fertilizer 

 salts on the other, with a review of various Bulletins of the U. S. 

 Bureau of Soils along this line. — Trelease.] 



Livingston, B. E. 1909. A repeated cycle in assimilation. (Plant 

 World. XII. p. 66—67.) 



Miekel, H. 1909. Untersuchungen über den Einfluss der Krüm- 

 mungsenergie des Samens auf die Entwicklung und Produktion 

 der Gerstenpflanze. (Leipzig 1909. 8°. 81 pp. 1 Taf.) 



Robinson. W. J. 1909. Experiments on the effect of the soil of 

 the Hemlock Grove of the New York botanical Garden upon seed- 

 lings. (Journ. New York bot. Gard. X. p. 81—87. 1 fig.) 



