264 GENETICS [BoT. Absts., Vol. X, 



type, and each face a possible phenotype resulting therefrom. Die a may produce 5 pheno- 

 types (2, 3, 4, 5 and 6) similar to certain phenotypes produced by die h, representative of a 

 2nd genotype. Die a may also produce 4 phenotypes (3, 4, 5 and 6) similar to certain pheno- 

 types produced by die c; 3 similar to phenotypes produced by die d; 2 similar to phenotypes 

 produced by die e; and 1 similar to a certain phenotype produced by die /. The records of 

 actual castings so designed as to produce results comparable to filial regression, rating of 

 pure lines, pure-line selection, and somatic selection are presented in 5 tables. — Edward N . 

 Wentworth. 



1725. La Vaulx, R. db. L'intersexualite chez un Crustace Cladocere: Daphne atkinsoni 

 Baird. [Intersexuality in a cladoceran, Daphnia atkinsoni.] Compt. Rend. Acad. Sci. Paris 

 169: 97-99. 1919. — The author thinks improper nutrition one of the causes of the appearance 

 of intersexes, of which 135 were obtained. (In an earlier paper he attributed intersexes to 

 unfavorable nutrition during a sexual cycle.) Intersexuality is inherited, but in most irregu- 

 lar fashion. One side of an animal is frequently more modified than the other, but every part 

 capable of sexual modification may be intermediate in its sexual character. Gonads are 

 usually functional ovaries, but rarely may be part ovary and part testis and produce both 

 eggs and sperm. The writer abandons the term gynandromorph formerly applied to his 

 abnormally sexed Cladocera and uses the term intersex, although objecting to the reviewer's 

 distinction between the terms gynandromorph and sex intergrade (or intersex). — A. M. Banta. 



1726. Leitch, I. A study of the segregation of a quantitative character in a cross between 

 a pure line of beans and a mutant from it. Jour. Genetics 11: 183-204. 4 fig- 1921. — The 

 author, continuing Johannsen's work with brown Princess beans crossed with a long-seeded, 

 evidently homozygous, mutant from the strain, secured F2 plants showing a transgressive 

 distribution in 1 direction. Of these he planted 4 types, 1 representing each original parent, 

 1 intermediate, and 1 the limit of transgressive variation. The original mutant type, the 

 M type, bred true, as did those of the intermediate and of the transgressive variation type, 

 the A^ type. The original pure line type, the E type, showed segregation according to simple 

 3:1 ratio. The results, 38 of M type and 112 each of E and A' types, were in general con- 

 firmed by further work. The simplest explanation is that a factor has been modified in the 

 original pure line to give the mutation. The theory of loss of a factor or factors obviously 

 can not be applied. — L. R. Waldron. 



1727. Lenz, F. tJber geschlechtsgebundene Erbanlagen fiir Augenfarbe. [Sex-linked 

 factors for eye color.] Arch. Rassen- u. Gesellschaftsbiol. 13: 298-300. 1921. — Lundborg 

 has gathered statistics showing that in Sweden 5.2 ± 13 per cent males and 11.2 ± 1.9 per 

 cent females have brown eyes, in Finland, 6.3 per cent males and 11.3 per cent females. The 

 female rate being double the male rate indicates that the factor for brown eyes may lie in 

 the sex chromosome, which is double in females and single in males, the egg having double 

 the chance of getting the brown-bearing chromosome from the sperm. As the proportion of 

 brown increases in the population the female percentage will not be double the male, because 

 the chance that the brown-eyed female is duplex brown is increased and therefore the potency 

 of certain of the brown-bearing sperm is masked by the brown chromosome already in the 

 egg. — This law of sex-linking of brown eye color can not be generalized. It does not apply to 

 data from middle Europe or America. Perhaps it is a property of the Mongoloid race. — 

 C. B. Davenport. 



1728. Levine, CO. The water buffalo — A tropical source of butter fat. Jour. Heredity 

 11: 51-64. 9 fig. 1920. — The author describes the water buffalo of China and presents data 

 on its reproduction, diseases, and uses as a draft and dairy animal. Analyses of the milk 

 showed an average of 12.5 per cent fat, 3 times that of dairy cows. The quantity of milk 

 produced is less, but the amount of butter fat compares favorably with that produced by 

 good cows. The author believes that rapid improvement can be made by selection, and that 

 immunity to tick fever and tuberculosis in addition to its dairy qualities will make the buffalo 

 the leading dairy animal of South China. He comments on its possible usefulness in the 

 U. S. A..—Sewall Wright. 



