78 EXPERIMENT STATION RECORD. 



was iucreusod and no ill effects noted. The yield dropped in 4 days after the 

 light was discontinued. 



Poultry raising and the increased price of meat, K. Wagner (Friclcs 

 Rundschau, 1910, Nov. 5; abs. in Internat. Inst. Agr. [Rome], Bui. Bur. Agr. 

 Intel, and Plant Diseases, 1910, No. 2, p. 318). — It is suggested that instead of 

 offering money prizes at poultry shows the prizes should be distributed among 

 poultry farmers undertaking to put a certain number of fowls and eggs on the 

 market every year at fixed prices, and to those raising the best 4-month chick- 

 ens and 8-month hens for breeding. Other measures recommended for encour- 

 aging the poultry industry are leasing of pasture lands, granting of subsidies 

 to poultry societies, and offering more poultry courses in agricultural schools. 



The white laced red Cornish fowl, W. II. Cabd [Rel. Poultry Jour., 18 

 {1911), No. 2, pp. 236, 265-267, figs, 2).— An account of the origin and charac- 

 istics of a comparatively new breed that was not a chance creation but " a 

 variety whose evei-y characteristic was thought out and attained after persistent 

 effort and intense study of the laws of nature regarding feather markings and 

 undercolor that are in harmony with popular market requirements, also the 

 laws of nature regarding egg production and flesh properties." 



The Indian Runner duck book, C. S. Valentine {Ridgewood, N. J., 1911, 

 pp. 89, figs. 8). — ^A practical work written to supply information on this variety 

 of duck, which has recently become vei-y popular. 



Darwinism, biometry and some recent biology, I, K. Pearson {BionietriJca, 

 7 (1910), No. 3, pp. 368-385).— A discussion of the elimination of the unfit, the 

 inheritance of the somatic characters on which fitness depends, and the ab- 

 sence of differential fertility. 



Recent papers by Pearl (E. S. R., 21, p. 372), Jennings (B. S. R., 21, p. 469). 

 Lloyd (E. S. R., 22, p. 672) and others are reviewed, and it is stated that there 

 is no justification for the conclusion of these authors that selection has no 

 effect within the pure line. It is also maintained that the only way in which 

 it can be determined whether selection within the pure line is effective is to 

 compare the correlation of the offspring with both parents and grandparents in 

 a parthenogenetic species. In the only cases in which this has been done the 

 parental correlation is greater than the grandparental, which would indicate a 

 cumulative effect of selection. 



The correlation between horn and hoof development, G. Heerwagen (Deut. 

 Landio. Tiei-zucht, IJf (1910), Nos. 17, p. 19. 'i; J,2, i)p. J,97, 498).— The author 

 criticizes the findings of Laurer (E. S. R., 23 p. 174) on the ground that there 

 was too wide a variation within the group, that the age of the animals was 

 not considered, and that not enough animals were measured to warrant draw- 

 ing definite conclusions. 



[The correlation between horn and hoof development], G. Laurer {Deut. 

 Landw. Tierzucht, l-'i (1910), No. 29, pp. 3ItO-3J{2 ; 15 (1911), No. 6, pp. 62-66).— 

 Replies to the criticism noted above. 



The function of the corpus luteum (Jour. Amcr. Med. Assoc., 56 (1911), 

 No. 8, pp. 595, 596). — ^An editorial which summarizes recent work,** from which 

 it is evident that secretions of the corpus luteum affect the sexual cycle. One 

 important function seems to be the prolongation of the length of time between 

 two successive ovulations. The secretion sensitizes the uterine mucosa so that 

 it reacts to any sort of mechanical stimulus toward forming the maternal 



° For references to recent studies on the histology of the corpus luteum and 

 the secretions of germinal glands of both sexes of different animals see Zentbl. 

 Oesam. Physiol, u. Path. Stofficechsels, n. ser., 6 (1911), No. 5, pp. 214-224. 



