No. 1, Mat, 1921] GENETICS 49 



315. P[openoe], p. a contribution to eugenics. [Rev. of: Dtjnlap, Knight. Personal 

 beauty and racial betterment. C. V. Mosby Co.: St. Louis, 1920.] Jour. Heredity 11: 

 258. 1920. 



316. P[openoe], p. Eugenics made easy. [Rev. of: Humphrey, Seth K. The racial 

 prospect. £61 p. Charles Scribner's Sons: New York, 1920.] Jour. Heredity 11: 237. 1920. 



317. P[openoe], p. a French student of the birth-rate. [Rev. of: Rageot, Gaston. 

 La Natalite. (Natality.) 296 p. Ernest Flammarion: Paris, 1918.] Jour. Heredity 11: 237. 

 1920. 



318. P[openoe], p. a text book of biology. [Rev. of: Shull, A. Franklin, George La 

 Rue, and Alexander G. Ruthven. Principles of animal biology. 16 X 24 cm., ix + 441 p., 

 US fig. McGraw-Hill Book Co. : New York, 1920.] Jour. Heredity 11 : 214. 1920. 



319. Punnett, R. C, and P. G. Bailet. Genetic studies in poultry. II. Inheritance of 

 egg-colour and broodiness. Jour. Genetics 10:277-292. / pi., 11 fig. 1920. — Reciprocal 

 crosses between Brown Leghorns which are not broody and lay white eggs and Black Lang- 

 shans which are broody and lay brown eggs, also crosses between the Langshans and Gold- 

 Pencilled Hamburghs, were made with the following results. — Egg color: — Leghorn 9 X 

 Langshan cf : Fi, intermediate; Fj, nearly half white, the rest tinted, but mostly lighter tints. 

 Reciprocal cross: Fi, as before; Fo, all shades represented, but curve slightly bimodal. Lang- 

 shan 9 X Hamburgh cf : Fi, as before; F2, all grades represented and curve distinctly bi- 

 modal. The results in this case are explained on the basis of a major factor for egg pigment 

 and several minor factors all of which are thought to be present in the Langshans and absent 

 in the others. — Broodiness: Leghorn 9 X Langshan cT : Fi, broody; F2, 19 broody, 47 non- 

 broody. Langshan 9 X Leghorn cf : Fi, broody; F2, 8 non-broody. Langshan X Hamburgh: 

 Fi, slightly broody; F2, 4 broody, 34 non-broody. — H. G. May. 



320. Richet, Charles. La selection humaine. [Human selection.] 8°, 262 p. F. 

 Alcan: Paris. 1919. 



321. Richet, Charles, et Henry Cardot. La transmission hereditaire des caracteres 

 acquis et I'accoutumance des microbes. [The hereditary transmission of acquired characters 

 and the tolerance of the microbes.] Compt. Rend. Acad. Sci. Paris 171: 1353-1358. 1920. 



322. Riddle, Oscar, and Ellinor H. Behre. On the relation of stale sperm to sterility 

 and sex in ring-doves. [Abstract.] Anat. Rec. 20: 211. 1921.— The very abnormal sex ratios 

 obtained from hybrid birds by several investigators require the study of all factors possibly 

 concerned. Practical work in pigeon hybridization also sometimes requires a knowledge of 

 the length of time the sperm may remain alive in the female oviduct. On the latter point, 

 it is found that the spermatozoa of the ring-doves (mostly fully fertile hybrids of closely 

 related species) used retained their fertilizing power during very nearly 8 days, reckoned from 

 the time of isolation of the male to the hour the egg is laid. — "Staleness" of the spermatozoa 

 did not appreciably aflfect the sex ratio in 213 individual tests made with a dozen pairs of birds. 

 The degree of staleness was known in each test. Some of the sex ratios obtained during the 

 experiment cannot be considered normal but these abnormal ratios have been shown to be 

 associated with other factors investigated earlier. The abnormal sex ratios that have been 

 obtained in previously reported investigations on these doves, and any results that may be 

 later obtained from them or from similar birds, are here shown to be not complicated by effects 

 due to staleness of the spermatozoa. — Oscar Riddle and Ellinor H. Behre. 



323. RioLLE, Y. Trouard. Les hybrides de Raphanus. [Raphanus hybrids.] Rev. 

 G6n. Bot. 32 : 438-447. Fig. 1-3. 1920.— The author previously studied hybrids of R. Ra- 

 phanistrum with varieties of R. sativus and found superficial homogeneity in Fi and 

 visible dissociation in F2. She now attempts to demonstrate that while Fi is homogeneous 



