Neue Litteratur. 115 



Gates, R. R. 1916. On pairs of species. (Bot. Gaz. LXI. p. 177 — 



212. 12 f.) 

 Goeldi, E. A. 1915. Ueber das Geschlecht in Tier- und Pflanzenreich, 



insbesondere im Lichte der neueren Vererbungslehre. (Bern 1915. 



8". 66 pp. ill.) 

 Grantham, A. E. and F. Groff. 1916. Occurence of sterile spikelets in 



wheat. (Journ. agr. Res. VI p. 235—250. 1 pl.) 

 Güssow, H. T. 1916. Degeneration of potatoes. (Journ. r. hört. Soc, 



XLI. p. 465-468.) 

 Lotsy, J. P. 1916. Die endemischen Pflanzen von Ceylon und die 



Mutationshypothese. (Biol. Cbl. XXXVI. p. 207—209.) 

 Muller, H. J. 1916. The mechanism of crossing-over. II. (Amer. Nat. 



L. p 284-305.) 

 Nohara, S. 1915. Genetical studies on Oxalis. (Journ. Coli. Agr, To- 

 kyo. VI. p. 165-182. 1 pl.) 

 Pascher, A. 1916. Ueber die Kreuzung einzelliger, haploider Orga- 

 nismen: Chlamydomonas. (Ber. deutsch, bot. Ges. XXXIV. p. 



228-242. 5 A.) 

 Pitsch, 0. 1916. De strijd om het bestaan in het proces der evolutie 



van de levende Organismen. (Med. R. H. L.-, T.- en B.-School 



Wageningen. X. p. 163—281. Nederl. en duitsch.) 

 Schöniand, S. 1916. A criticism of Lotsv's theory of evolution. (S. 



afric. Journ. Sc. XII. p. 257—265.) 

 Standish, L. M. 1916, What is happening to the hawthorns? (Journ. 



of Hered. VII. p. 266—279. 11 f.) 

 Tammes, T. 1916. Die gegenseitige Wirkung genotypischer Faktoren. 



(Rec. Trav bot. neerland. XIII. p. 44—62.) 

 Tammes, T. 1915. On the mutual effect of genotypic factors. (Proc. 



kon. Ak. Wet. Amsterdam. XVIII. p. 1056.) 

 Vries, H. de 1916. Principos de la teoria de la mutacion. Traducido de 



„Science", N. S., Vol. XL, N'^ 1020, por el Prof. I. Ochoterena. 



(Bol. Direcc. Est. biol. I. p. 286-296.) 

 Willis, J. C. 1916. Further deductions from the figures of rarity of 



the Ceylon flora. (Rep. 85. Meet. british Ass. Adv. Sc. Manchester 



1915, London 1916. p. 726.) 



VI. Physiologie. 



Amstel, J. E. van 1916. On the influence of temperature on the CO.,- 



assimilation of Helodea canadensis. (Rec. Trav. bot. neerland. XIll. 



p. 1—29. ill.) 

 Baker, S. M. 1916. On the liquid pressure theory of the circulation 



of sap in plants. (Rep. 85. Meet. british. Ass. Adv Sc. Manchester 



1915, London 1916. p. 722-723.) 

 Darwin, F. 1916. On the relation between transpiration and stomatal 



aperture. (Phil. Trans, r. Soc. London. B. CCVII. p. 413-437 ) 

 Delf, E. M. 1916. Studies of protoplasmic permeability by measure- 



ment of rate of shrinkage of turgid tissues. I. The influence of 



temperature on the permeabilitj^ of protoplasm to water. (Ann. of 



Bot. XXX. p. 283-310. 17 f. 5 t.) 

 Delf, E. M. 1916. The effect of temperature on the permeability 



of protoplasm to water. (Rep. 85. Meet. british Ass. Adv. Sc. 



Manchester 1915, London 1916. p. 723—725.) 

 Gates, F. C. 1916. The daily movements ofleguminous leaflets. (Plant 



World. XIX. p. 42—45. 2 f.) 

 Goebel, K. 1916. Zu Jacques Loeb's Untersuchungen über Rege- 



