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



stems with few colors and foliage long and ungainly. Continued selection and crossing 

 brought compact habit, shorter foliage, shades of color ranging from white through rose, 

 pink to salmon, red, violet and blue, also yellow, remarkable floriferousness, long succession 

 of bloom, lasting quality of flowers and numerous handsome habit types. Many species 

 have been used in hybridization work. Names given. Flowers of some varieties reach 4.5 

 inches and have long stems. Color races are fixed and breed true. Detailed description of 

 culture is given. Seedlings flower in seven months. — Orland E. White. 



679. Heribert-Nilsson, N. Zuwachsgeschwindigkeit der pollenschlauche und gestorte 

 Mendelzahlen bei Oenothera Lamarckiana. [Decline in pollen-tube growth and deranged Men- 

 delian ratios in Oenothera Lamarckiana.] Hereditas 1: 41-67. 1 fig. 1920. 



689. Hertwig, Paula. Haploide und diploide Parthogenese. [Haploid and diploid par- 

 thenogenesis.] Biol. Zentralbl. 40: 145-174. April-May, 1920. 



681. Honing, J. A. Selection studies with Deli tobacco. Teysmannia 30: 1-11. 2 pi. 

 1919. 



682. Hooper, J. J. A study of inheritance of coat colors in Jersey cattle. Science 52: 

 43. July 9, 1920. — Author's abstract of paper read before Seventh Annual Meeting, Kentucky 

 Academy of Science, Lexington, May 8, 1920: Studies of inheritance of Jersey cattle coat colors 

 by the author show that white spots are recessive to dominant solid color, and a white tongue 

 and tail-switch also are recessive. Colors of 1145 calves were tabulated and compared with 

 those of their 2290 sires and dams. Some bulls studied seemed to be pure dominants, as 

 their calves were all solid in color, although as many as a hundred were sired by each bull. 

 It was found that 66 per cent of Jersey cattle are solid in color and have black tongue and 

 switch, while 12 per cent are broken and have white tongue and switch; 3.6 per cent are solid 

 and have white tongue and black switch, etc. — J. J. Hooper. 



683. Hume, A. N. A system for breeding corn or gregarious animals. Jour. Heredity 11: 

 191- 192. April, 1920. 



684. Ikeno, S. Etudes d'heredite sur la reversion d'une race de Plantago major. [Genet- 

 ical studies on reversion in a race of Plantago major.] Rev. Gen. Bot. 32: 49-56. 1920. — 

 Author reports on variety of P. major called contractu with leaves rounder, smaller and thicker, 

 and spikes much shorter than in typical P. major. Crossings of contracta and the type led 

 to an F2 of 2525 typical : 826 contracta. Inbred contracta gave 3 per cent of plants like typical 

 P. major; these reversions proved heterozygous and gave 3 typical to 1 contracta on selling. 

 Author discusses possible place or time at which the reversionary mutation in contracta gene 

 occurred. — James P. Kelly. 



685. Jones, D. F. Heritable characters of maize. IV. A lethal factor— defective seeds. 

 Jour. Heredity 11: 161-167. 7 fig. April, 1920. 



686. Jost. [German rev. of: Lehmann, Ernst. Uber die Selbststerilitat von Veronica 

 syriaca. (On the self sterility of Veronica syriaca.) Zeitschr. indukt. Abstamm. Vererb. 21: 

 1-47. 1 fig. May, 1919. (See Bot. Absts. 3, Entry 2159.)] Zeitschr. Bot. 12: S7. 1920.— 

 See also Bot. Absts. 6, Entry 695. 



687. Kappert, H. Uber das Vorkommen vollkommener Dominanz bei einem quanti- 

 tativen Merkmal. [The occurrence of complete dominance in a quantitative character.] Zeit- 

 schr. indukt. Abstamm. Vererb. 22: 199-209. 1 fig. Mar., 1920.— In two varietal crosses of 

 peas — Laxtons Vorbote X William Hurst and Mammuterbse X William Hurst — the author 

 found no significant difference between homozygous tall and heterozygous tall plants with 

 respect to the following characters: total height of plant, average length of internodes, and 

 number of internodes. Data are presented on a small F2 and F 3 population for one cross and 

 on a somewhat larger F2, F 3 , and F 4 population for the other. — R. J. Garber. 



