No. 2, September, 1920] GENETICS 207 



does not apparently hold in the only two back-crosses listed, although the total number of 

 individuals is slightly less than 100. The author then suggests the presence of a lethal factor 

 (T) but does not develop this idea. — E. W. Lrindstrom. 



1566. Lipschutz, A. Bemerkung zur Arbeit von Knud Sand uber experimentellen Her- 

 maphroditismus. [Comments on the work of Knud Sand on experimental hermaphroditism.] 

 Pfliiger's Arch. 176: 112. 1919. 



1567. Little, C. C. A note on the origin of piebald spotting in dogs. Jour. Heredity 11: 

 12-15. 1 fig. Jan., 1920. 



1568. Little, C. C. Is there linkage between the genes for yellow and for black in mice. 

 Amer. Nat. 54: 267-270. May-June, 1920. — Discussion of recent paper of Dunn's referring to 

 a deficiency of black young in a family of yellow mice. Because of small number of offspring 

 involved, it is pointed out that the deviation from normal expectation may be entirely a 

 matter of chance. Dunn states that yellow and black may possibly be linked. Author calls 

 attention to the fact that yellow and agouti are allelomorphic and that agouti has been shown 

 not to be linked to black. Author gives alternative explanation for observed facts, viz., as- 

 sumption is made that a lethal factor is linked to black in the family above noted, and that 

 this lethal is effective in a heterozygous condition in non-yellow mice but not in yellow mice. 

 — H. L. Ibsen. 



1569. Little, C. C. The heredity of susceptibility to a transplantable sarcoma (J. W. B.) 

 of the Japanese waltzing mouse. Science 51: 467-468. May 7, 1920. — In a cross between a 

 Japanese waltzing mouse one hundred per cent susceptible to a transplantable sarcoma 

 (J. W. B.) and the common non-waltzing mouse not susceptible to the sarcoma, the Fi gener- 

 ation hybrids were all susceptible to the sarcoma, but the F 2 hybrids gave a total of twenty- 

 three susceptible to sixty-six non-susceptible animals thus supporting the expectations on 

 the three-, four-, five-, and seven-factor hypotheses. — To determine more closely the number 

 of factors involved Fi hybrid mice, — themselves susceptible, — were crossed back with the 

 non-susceptible parent race. The numbers obtained were twenty-one susceptible to 208 

 non-susceptible which indicates that from three to five factors— probably four — are involved 

 in determining susceptibility to the mouse sarcoma (J. W. B.). — Simultaneous presence of 

 these factors is considered necessary for susceptibility. None of these factors is carried in 

 the sex (X) chromosome since all the "X" chromosomes in the resulting animals, of the 

 back-cross, if the original mating is a non-susceptible female with a susceptible male, will 

 be derived from the common non-susceptible mice. — Mary B. Stark. 



1570. Lo Priore, G. Sulla ereditarieta. della fasciazione nelle spighe del mais. [On the in- 

 heritance of a fasciation in the maize ear.] Staz. Sper. Agr. Ital. 51 : 415-430. 1918. — Four fasci- 

 ated ears of maize were found in 1902. A progeny of these, grown from open-pollinated seed, 

 produced fasciated ears on one-third of the plants. The second year 40 per cent of the plants 

 bore fasciated ears, while in the third year the progeny of a better-fasciated ear produced 

 such ears on 60 per cent of the plants. The plants with fasciated ears showed no other abnor- 

 malities and yielded exceptionally well. The author concludes that a fasciated race of maize 

 can be developed b}- selection although the abnormal form is transmitted to only a part of 

 the offspring and according to laws of heredity not yet formulated. — The relation of traumatic 

 and chemical treatment to the development of fasciations and other abnormalities as well as 

 the relation of fasciation to the origin of the normal maize ear is discussed. — J. II. Kcmpton. 



1571. Losch, Hermann. Ascidienbildung an Staubfaden vergriinter Bliiten von Tropae- 

 olum majus. [Ascidia formation on stamens of virescent flowers of Tropaeolum majus.l Ber. 

 Deutsch. Bot. Ges. 37: 369-372. Dec, 1919. — Describes on virescent stamens of Tropae- 

 olum majus ascidia in various stages of development. Inner side of ascidium is foliar under 

 side. — James P. Kelly. 



