Neue Litteratur. 19 



Meyer, F. J. 1918. Der Generationswechsel als Wechsel ver- 

 schiedener Morphoden. [V. M.]. (Ber. deutsch, bot, Ges. XXXVI. 

 p. 381—384.) 



Sakamura, T. 1918. Kurze Mitteilung über die Chromosomenzahlen 

 und die Verwandtschaftsverhältnisse der Triticum- Arten. (Bot. 

 Mag. Tokyo. XXXII. p. 150—153.) 



Whitelegge, T. 1916. The gametophyte of Psilotum: preliminary notes. 

 (Proc. Linn. Soc. N. S. Wales. XLI. p. 553—563. pl.) 



V. Varietäten, Descendenz, Hybriden. 

 Cf. III. Tisehler. 



Atkinson, G. F. 1918. Twin hybrids from crosses of Oenothera La- 

 marckiana and Franciscana with Oe. pycnocarpa, in the F^ and 

 Fa. (Proc. amer. philos. Soc. LVII. p. 130—143. 4 pl.) 



Beauverd, M. 1918. Un erable hybride inödit (X Acer Guyoti Beau- 

 verd). (Bull. Soc. bot. Geneve. 2. X. p. 11.) 



Bessey, E. A. 1917. The phylogeny of the grasses. (Annual Rep. 

 Michigan Ac. Sc. XIX. p. 239-245.) 



Coulter, J. M. and M. C. 1918. Plant genetics. (Chicago, Univ. Press. 

 1918. 80. IX, 214 pp. 40 f.) 



Coutinho, A. X. P. 1918. Une nouvelle vari^te de ricin. (Bull. Soc. 

 portugaise Sc. nat. VIII. p. 82-83. 5 f.) 



East, E. M. 1918. The r61e of reproduction in evolution. (Amer. Nat. 

 LH. p. 273-289.) 



East, E. M. and J. B. Park. 1918. Studies on self-sterility. IL Pollen- 

 tube growth. (Genetics. III. p. 353 — 366. 3 f.) 



Emerson, R. A. 1918. A fifth pair of factors Aa, for aleurone color 

 in maize, and its relation to the Cc and Rr pairs. (Mem. Cornell 

 Univ. Agr. Exp. Stat. 1918, 16.) 



Fernald, M. L. 1918. An intergeneric hybrid in the Cyperaceae. 

 (Rhodora. XX. p. 190—191. 1 pl.) 



Fiseher, E. 1918. Die Beziehungen zwischen Sexualität und Repro- 

 duktion im Pflanzenreich. (Mitt. natf. Ges. Bern. 1918, 4 pp.) 



Genetica. 1918. Nederlandsch Tijdschrift voor Erfelijkheids- en 

 Afstammingsleer. Redactie: Dr. J. P. Lotsy (Haarlem), Secr. der 

 Red.: Dr. M. J. Sirks (Wageningen). ('s-Gravenhage, M. Nijhoff. 

 1918. 80.) 



Goodspeed, T. H. and R. E. Clausen. 1918. An apparatus for flower 

 measurement. (Univ. California Publ. Bot. V. p. 435—437. 1 pl. 1 f.) 



Hance, R. T. 1918. Variations in the number of somatic chromoso- 

 mes in Oenothera scintillans de Vries. (Genetics. III. p. 225—275, 

 5 f. 7 pl.) 



Harris, J. A. 1918. Further illustrations of the applicability of a 

 coefficient measuring the correlation between a variable and the 

 deviation of a dependent variable from its probable value. (Gene- 

 tics III. p. 328—352.) 



Hartwig, 0. 1918. Das Werden der Organismen. Zur Widerlegung von 

 Darwin 's Zufallstheorie durch das Gesetz in der Entwicklung. 

 2 Aufl. (Jena, G. Fischer, 1918. 8°. XVIII, 680 pp. 115 A. Preis 24 

 oder 28 Mk.) 



Jones, D. F. 1918. Segregation of susceptibility to parasitism in maize. 

 (Amer. Journ. Bot. V. p. 295—300.) 



Koch, L. 1918. Verdere onderzoekingen betreffende de praktijk; 

 waarde van de lijnenselectiemethode, mede in verband met het 

 gemengd planten van varieteiten. (Teysmannia. XXIX. p. 389— 423.) 



Kraus, cT 1917. Untersuchungen über die Vererbungsverhältnisse 



