98 GENETICS [Bot. Absts., Vol. VI, 



699. Lehmann, E. [German rev. of: von Ubisch, G. II. Beitrag zu einer Faktoren- 

 analyse von Gerste. (Second contribution to a factorial analysis of barley.) Zeitschr. indukt. 

 Abstamm. Vererb. 20: 65-117. 7 fig. 11 diagrams. Jan., 1919.] Zeitschr. Bot. 12: 171-172. 

 1920 



700. Levine, C. O. Native horses and cattle in the Orient. Jour. Heredity 11: 147-155. 

 Frontispiece, 4 fig- April, 1920. 



701. Ljung, E. W . Svalofs foradlade Vasarag. [Svalofs improved Vasa-rye.] Sveriges 

 Utsadesf. Tidskr. 28: 71-81. 1918. — Describes a new rye variety obtained in Sweden by selec- 

 tion from Common Vasa-rye. — K. V. Ossian Dahlgren. 



702. Lotsy, J. P. Oenothera-proeven in 1919. [Oenothera experiments in 1919.] Genet- 

 ica 2: 200-213. 5 fig. May, 1920. 



703. Lotsy, J. P. Theoretische steun voor de Kruisings-theorie. [Theoretical basis for 

 the theory of the origin of species through hybridization.] Genetica 2: 214-234. May, 1920. 



704. Lotsy, J. P. [Dutch rev. of: de Lint, G. M. Over de verspreiding van Eurytemora 

 affinis Poppe en Eurytemora hirundoides Nordquist in Nederland. (Distribution of Euryte- 

 mora affinis Poppe und Eurytemora hirundoides in Netherlands.) Mededeel. Wetenscbap. 

 Vergader. Nederl. Dierk. Ver. 1919.] Genetica 2: 264-266. May, 1920. 



705. Lotsy, J. P. [Dutch rev. of: Semon, Richard. Uber das Schlagwort "Lamarck- 

 ismus." (On the catch-word "Lamarckism.") Zeitschr. indukt. Abstamm. Vererb. 22: 51- 

 52. Dec, 1919.] Genetica 2: 269-271. May, 1920. 



706. Lotsy, J. P. [Dutch rev. of: von Tschermak, E. Beobachtungen iiber anschein- 

 ende vegetative Spaltungen an Bastarden und iiber anscheinende Spatspaltungen von Bastard- 

 nachkommen, speziell Auftreten von Pigmentierungen an sonst pigmentlosen Deszendenten. 

 (Observations on apparent vegetative splitting in hybrids, and on apparently belated splitting in 

 hybrid offspring, especially the occurrence of pigmentation on otherwise pigmentless descend- 

 ants.) Zeitschr. indukt, Abstamm. Vererb. 21: 216-232. 1 fig. Nov., 1920.] Genetica 2: 

 278-2S4. May, 1920. 



707. Lundborg, H. Hereditary transmission of genotypical deaf-mutism. Hereditas 1 : 

 35-10. 1920. 



708. MacDowell, Edwin Carleton. Bristle inheritance in Drosophila. III. Correla- 

 tion. Jour. Exp. Zool. 30: 419-469. 8 fig. May 20, 1920.— Author analyses the data presented 

 in two earlier papers by means of the correlation table. He also studied four more unselected 

 generations of same strain. The former data consisted of 49 generations of selection for high 

 bristle number in a strain of Drosophila melanogaster. His former conclusions were as fol- 

 lows: (1) Extra bristles behaves as a simple Mendelian character when crossed to the wild. 

 (2) Selection was effective for a few generations and then ceased. (3) Selection was effective 

 because genetic differences existed among the germ-cells of the original extra-bristled flies. 

 (4) Selection ceased to be effective when the strain became homozygous. (5) There was no 

 evidence of germinal changes during selection. (6) The character was dependent to a large 

 extent upon the food. — By means of the correlation table he finds that the generations can be 

 divided roughly into three groups: 1, generatioris 2 to 10; 2, generations 11-34; 3, generations 

 35 to 49. In the first group the correlation coefficients are generally significant and positive; 

 in the second group they fluctuate, some being negative; in the third group the only significant 

 coefficients are negative. The author believes the fluctuations in the second group due to 

 non-genetic causes. It is only in the first group that he gets unquestionable positive corre- 

 lation. It was during this period that the means indicated that selection was effective. 

 Hence by the present method of analysis the author is forced to the same conclusions as in 



