766 EXPEEIMENT STATION EECOED. 



exei-ts its stimulating influence upon the offspring in intra-uterine life and 

 during lactation, and, when the experiment is carried further, and the feeding 

 to the young is continued after weaning, it has an even gi*eater stimulating 

 effect upon growth, weight, and development, and causes earlier and more 

 frequent breeding, and an increased number of offspring in the litters. The 

 stimulating effect upon the sex glands is greater the longer the influence of 

 anterior lobe administration is exerted. 



*' The extract of pituitary posterior lobe, even after prolonged administra- 

 tion, does not stimulate growth in general, nor the development of the sex 

 glands, as does anterior lobe even after a very short period. . . . 



"Ovarian extract (corpus luteum), when fed to the male, especially, causes 

 a tendency toward the deposition of fat, not only in the body generally, but 

 in the testes and other glands as well, with a resultant marketl increase in 

 weiglit. The fur is heavier and coarser than in the animal fed with the 

 posterior lobe extract. It does not cause an early descent of the testes. . . . 



" Following ovarian feeding there is, as compared with conditions in the 

 control, increased development and activity of the female sex glands, increased 

 follicle formation, a moderate increase in interstitial tissue and increased 

 branching of the fimbriated extremity of the tube. Prolonged ovarian fee«ling, 

 e. g., for 5 to 6 months, to the male rat, as compared with the control, has the 

 following effect : The gi'oss size and weight of the testes, both absolutely and 

 in proportion to the body development, is less, and liistologically the sex glands 

 of the male show a retarded development and evidences of diminished activity. 

 The definitely retarding influence of ovarian extract upon the male sexual 

 development is exerted throughout the life of the animal." 



Influence of various salts on the reproductive process, U. EitirERicH and 

 O. LoEW (Arch. Ilijg., 84 {1915), No. 6-7, pp. 261-2S2, fig. i).— This reports a 

 study made on the effect of calcium, sodium, and magnesium salts on the 

 number and weight of offspring and on the reproductive process of mice, 

 guinea pigs, and ralibits. 



Calcium cblorid increase<l the number of offspring and was decidedly 

 superior in this respect to either potassium chlorid or magnesium chlorid. 

 Sodium chlorid was also beneficial in increasing the number of offspring. It 

 is thought that these salts stimulate the production of the egg cells in the 

 ovary, thus resulting in larger litters. 



The control of sex by food in five species of rotifers, D. D. Whitxey (Jour. 

 Expt. ZooL, 20 (1916), No. 2, pp. 26S-296, figs. i.J).— It is shown that in the 

 American and English rotifer Iliidatina scnta food conditions are the con- 

 trolling factors in regulating the parthenogenetic production of the two sexes. 



Histological study of the " pigment specks " of swine, Oi.t (Ztschr. Flcisch 

 u. MUchln/g., 26 (1916), No. 7, pp. 91-100, fig. 1). — Tliis reports a microscopical 

 study made of the pigment specks found in the epithelial cells of the mammne 

 of swine. 



Acid poisoning due to oat feeding, A. ^Iorgkn and C. Beger (Hoppc- 

 Scylcfs Ztschr. rhgsiol. Chcm., 9^ (1915), No. 5-6, pp. 52^35).— In studies 

 with rabbits the authors found that the deleterious effect of oats fed alone was 

 not due so much to a lime deficiency as to an acid poisoning which results in a 

 bone disease. The addition of dicalcium phosphate was foiuid to be ineffectual 

 in remedying this condition, as was also sodium chlorid. Sodium carl)onate 

 proved to be the most effectual In neutralizing the effect of tlie acid poisoning 

 and in increasing the live weight of tlie ralibits. 



Bacteriological studies on forage conservation in the silo, 0. Gorini (Ann. 

 Ist. Ayr. [Milan], 12 (1913-11,), pp. S9-105, fig. i).— This is a continuation of 



