322 GENETICS [Bot. Absts. 



2157. Lehmann, E. [Rev. of: (1) Bateson, W., and C. Pellew. On the genetics of 

 rogues among culinary peas (Pisum sativum). Jour. Genetics 5: 13-36. 1915. (2) Biffen. 

 The suppression of characters on crossing. Jour. Genetics 5:225-228. 1915. (3) Back- 

 house, W. O. The inheritance of glume length in Triticum polonicum. A case of zygotic 

 inhibition. Jour. Genetics 7: 125-133. 1918. [See Bot. Absts. 1, Entry 211.] (4) Caporn, 

 A. St. Clair. The inheritance of tight and loose paleae in Avena nuda crosses. Jour. Ge- 

 netics7:229. 1918. [See Bot. Absts. 1, Entry 866.] (5) Idem. An account of an experiment 

 to determine the heredity of early and late ripening in an oat cross. Jour. Genetics 7:247. 

 1918. [See Bot. Absts. 1, Entry 867.] (6) Idem. On a case of permanent variation in the 

 glume lengths of extracted parental types and the inheritance of purple colour in the cross 

 Triticum polonicum and T. Eloboni. Jour. Genetics 7:259. 1918. [See Bot. Absts. 1, 

 Entry 868.] Zeitschr. Bot. 10: 758-763. 1918. 



2158. Lehmann, E. [Rev. of: Heribert-Nilsson, Nils. Experimentelle Studien iiber 

 Variabilitat, Spaltung, Artbildung und Evolution in der Gattung Salix. (Experimental studies 

 on variability, segregation, speciation and evolution in the genus Salix). Lunds Univ. Ars- 

 skrift 14: 1-145. 65 fig. 1918.] Zeitschr. Bot. 11: 205-212. 1919. 



2159. Lehmann, Ernst. Uber die Selbststerilitat von Veronica syriaca. [On the self- 

 sterility of Veronica syriaca.] Zeitschr. indukt. Abstamm. Vererb. 21:1-47. lfig. May, 1919. — 

 In a year of investigation with Veronica syriaca, not a single self-fertile plant was found. Sub- 

 sequently, in a cross between two self-sterile individuals, 114 Fi plants were studied. All 

 proved to be self-sterile. These plants fell into four groups of about equal size which were 

 intra-class sterile and inter-class fertile. Samples from each class were planted in isolated 

 plats, but produced no seed. The author promises a Mendelian interpretation. — E. M. 

 East. 



2160. Lehmann, E. [Rev. of: White, O. E. Inheritance studies in Pisum. I. Inherit- 

 ance of cotyledon color. Amer. Nat. 50:530. 1916.] Zeitschr. Bot, 10: 763-764. 1918. 



2161. Leighty, C. E., and T. B. Hutcheson. On the blooming and fertilization of wheat 

 flowers. Jour. Amer. Soc. Agron. 11: 143-162. 2 fig. 1919. — Authors, working with Minne- 

 sota- and Virginia-grown varieties of wheat, observe that in 2977 cases the time of blooming 

 is approximately evenly divided between night and day. In day time, morning-blooming 

 is slightly more frequent than afternoon-blooming. Although undetermined, it is suspected 

 that night-blooming actually occurs in early morning hours. Two active periods of day- 

 blooming with peaks of curves at 8 a.m. and 4 p.m., suggest temperature relations as pos- 

 sible cause of such distribution. The observations correct the impression that wheat blooms 

 only in early morning. The duration of period of blooming covers from 2 to 7 days, Minne- 

 sota-grown wheat produced kernels in 40.97 per cent of 1240 flowers emasculated but not cov- 

 ered. Virginia-grown wheat produced kernels in 83.3 per cent of 1324 flowers so treated. 

 Resulting from errors of manipulation, 8 kernels, 0.78 per cent, were produced from 1030 

 flowers emasculated and covered. For accuracy in cross-pollinations in wheat, protection of 

 the flowers is indicated. [See Bot, Absts. 3, Entry 1968.] — J. Ben Hill. 



2162. Lenz, Fritz. Alternative Modifikationen bei Schmetterlingen. [Alternative modifi- 

 cations in butterflies.] Zeitschr. indukt. Abstamm. Vererb. 19:304-309. Aug., 1918.— Refer- 

 ring to earlier work in which it was shown that pupae of butterfly Papilio machaon L. were 

 either green or gray (with some intermediate forms), and that while many green pupae hung 

 from stalks, most gray ones were attached to surfaces, author now reports that color is 

 largely due to intensity of light prevailing just before pupation. Full light results in green, 

 darkness in gray. Choice of place of pupation is also related in some way to light. Color 

 determination is regarded as adaptation to conditions in nature.— A . Franklin Shall. 



