No. 1, July, 1920J GENETICS < 5 



490. Anonymous. Mendelism in relation to horticulture. Gard. Chron. 66:215. Oct. 

 25, 1919. — Report of a lecture by J. A. Thomson. Be Btated that, through Mendelian experi- 

 ments with wheat, the increased yield in [ndia had been very great; while a value of Beveral 



millions ha- been :i<ltle<l to the productivity of Canada. — John Hilling. 



491. Anonymous (Student). An explanation of deviations from Poisson's law in practice. 

 Biometrika 12:211 215. Nov., 1919. — This paper at tempts to explore the general question 

 of what effect various departures from the conditions which lead to Poisson's Law have on 

 the resulting statistics, and especially which conditions lead to positive and which to nega- 

 tive binomials. It is shown by mat hemat ica I analysis t hat in those populations which might 

 be expected to follow Poisson's law: (1) they will do so if the only deviation from the ideal 

 conditions is that the chance of different individuals falling into the same divisions are not 

 equal, as long as these chances are all small; (2) if in addition to this the chances of some 

 individuals arc large, a positive binomial will fit the results better than the exponential; 

 (3) if the different divisions have different chances of containing individuals, as is most often 

 the case in many statistics, a negative binomial will fit the results better than the exponential 

 except so far as (2) may interfere; (4) if the presence of one individual in a division increases 

 the chance of other individuals falling into that division, a negative binomial will fit best; 

 but if it decreases the chance, a positive binomial will fit best. — John W. Gowen. 



492. Anonymous. Inheritance investigations in swine. Kansas Sta. Rept. 1918:42-43. 

 1918. — Greater width of forehead in Berkshire is dominant over lesser forehead widths of 

 Duroc Jerseys, Tamworths and the wild hog. Straight face of Tamw T orth is dominant over 

 dish face of Berkshire. Tamworth long face is dominant over Jersey short face. Erect ear of 

 Berkshire is dominant over drooping ear of Duroc Jersey. — H. L. Ibsen. 



493. Anonymous. Improvement and conservation of farm poultry. Kansas Sta. Rept. 

 1918:43-45. / fig. 1918. — Standard bred males from high-producing strains of Barred 

 Plymouth Rocks, single-comb White Leghorns, and White Orpingtons have been used in 

 grading up mongrel flocks. The third-generation grade females in the case of the Plymouth 

 Rocks and White Leghorns show marked increase in average first-year's production of eggs 

 as compared with their mongrel great granddams. White Orpingtons show slight decrease. 

 Check pen of mongrels showed slight increase. — H. L. Ibsen. 



494. Anonymous. Inheritance of color in Andalusian fowl. Kansas Sta. Rept. 1918: 45. 

 1918— Four factors seem to be responsible for feather color of Blue Andalusians: "(1) black 

 pigment; (2) a restrictor of black pigment which makes it appear bluish gray; (3) an ex- 

 tender which carries pigment to all feathers of the body, and (4) lacing, which is responsible for 

 the black edging of many of the contour feathers of both males and females." — H. L. Ibsen. 



495. Anonymous. Discoveries in China, useful in California. California Citrograph 

 3: 49-50. 1 fig. Jan., 1918. — On new r fruits; includes paragraph on plant breeding (selection) 

 by Chinese farmers. — Howard B. Frost. 



496. Anonymous. [Editorial.] Tree records important. California Citrograph 3:69. 

 Feb., 1918. Records of yields urged, in relation to bud variation. — Howard B. Frost. 



497. Anonymous. [Editorial.] Bud selection wins again. California Citrograph 3: 

 121. Apr., 1918. — Prize-winning pomelos credited to bud selection. — Hotvard B. Frost. 



49S. Anonymous. The elimination of poor citrus strains. California Citrograph 3: 

 224. July, 1918.— Brief, popular. 



499. Anonymous. [Editorial.] Why trees did not bear. California Citrograph 4:257. 

 Aug., 1919. — History of a case of budding to an inferior strain of orange, quoted from A. D. 

 Shamel. — Howard B. Frost. 



