No. 1, July, 1920] GENETICS 111 



between species of Aegilops and Tritlcum. Heredity and cytology.) Zei1 ichr. indukt. 

 AbBtamm. Vererb. 20: 177-240. 4 fig- Feb., 1919.] Zeitschr. Bot. 11:538^541. 1919. 



689. Onslow, II. The inheritance of wing colour on Lepidoptera. 1. Abraxas grossu- 

 lariata var. lutea (Cockerell). Jour, Genetics 8:209 259. PI. 9 to, £5 fig. Sept., 1910. — 

 Orange-yellow ground color of Intra, vs. white of type, is "incomplel ely dominanl ," or ra1 her, 

 since the mode of the narrowly fluctuating pale yellow of I-', is nearer the color value of the 

 almost white parent than that of the orange-yellow, "not completely recessive" is more exact. 

 Homozygous orange-yellow likewise gives typical probability-of-error curve. Hack-cross of 

 pale heterozygote with homozygous l«l<<i shows marked bimodal distribution, grouped about 

 color values of respective parents. Pj fluctuates more widely than Fi, showing primary mode 

 at color value of pale yellow parents and secondary mode in deep orange-yellow. Mendclian 

 segregation is thus indicated. In back-cross of a rather deeply colored Fi 9 X type (white), 

 yellow color of former "does not seem to have any effect." Simple curve, with its one mode 

 at very pale orange-yellow, results from this back-cross. Numerical color values deter- 

 mined by "tintometer," wdiich is described. In reciprocal crosses of lutea X lacticolor, the 

 usual tendency of femalcncss in this species slightly to inhibit development of yellow is exag- 

 gerated. "In the deepest colours the yellow pigment is diffused through the chitinous walls 

 of the scales without the formation of any granules." — J. H. Gerould. 



690. Onslow, H. Inheritance of wing colour in Lepidoptera. II. Melanism in Tephrosia 

 consonaria (var. Nigra Bankes). Jour. Genetics 9:53-60. / pi. Dec, 1919.— The geo- 

 metrid Trphrosia consonaria var. nigra, which is almost uniformly black in the 9 , brown- 

 ish-black in the cr", was crossed with the grayish, mottled type, to which it is completely 

 dominant. Extracted recessives differ from the type only in being grayer, less ochreous, 

 than most wild individuals. — J. H. Gerould. 



691. P airman, Eleanor, and Karl Pearson. On corrections for the moment coeffi- 

 cients of limited range frequency distributions when there are finite or infinite ordinates and 

 any slopes at the terminals of the range. Biometrika 12:231-258. Nov., 1919.— This paper 

 gives additional correction formulae for correcting the moments of frequency curves where 

 high contact is not present, in this sense therefore the paper is an extension of the correction 

 formulae of Sheppard. — Correction formulae are presented for all moments up to the seventh 

 for curves where the terminal frequencies are finite quantities as in the case of truncated 

 frequency distributions and where the terminal frequencies are infinite as for J and U curves. 

 Cases illustrative of the use of the formulae on actual frequency data are presented. — John 

 W. Gowen. 



692. Parker, John H. A preliminary study of the inheritance of rust resistance in oats. 

 Jour. Amer. Soc. Agron. 12: 23-38. 1920. — Pedigree lines of two oat varieties, Burt and Sixty- 

 day, together with a large number of F 2 generation hybrids between these varieties were 

 studied in relation to their rust resistance. The rusts used were the crown rust of oats, Puc- 

 cinia lolii avenae McAlpine and the stem rust of oats, Puccinia graminis avenae Erikss. 

 and Henn. Burt and Sixty-day and all the hybrids of these varieties so far tested were found 

 to be entirely susceptible to stem rust. All plants of Sixty-day also were uniformly sus- 

 ceptible to crown rust. Of 223 inoculated plants of Burt, 48 were classified as resistant, 152 

 as intermediate and 23 as susceptible. — F. M. Schertz. 



693. Parmenter, Charles L. Chromosome number and pairs in the somatic mitoses of 

 Ambystoma tigrinum. Jour. Morph. 33: 169-249. 9 pi. Dec. 20, 1919.— Material was 

 obtained from larvae of Ambystoma (or Amblystoma) tigrinum. Mitotic figures in epithelial 

 cells of tail, gill plates and lung, and of the endothelium from peritoneum and mesentery, 

 were studied. Author finds in 66 cells of 23 individuals that the chromosome number is con- 

 stantly 2S. Linear measurements indicate that the chromosomes of a cell form approxi- 

 mately a duplicate series of sizes, and there is considerable resemblance in the form of chromo- 

 somes that are members of the same pair. Approximate constancy in size relations between 



