870 EXPERIMENT STATION RECORD. 



the male fowl being an especiallj^ good animal because of the extensive develop- 

 ment of the characters to be studied. 



TTie histological studies revealed no cells in the interstitial tissue in the young 

 or old chicken testis with the cell bodies differentiated from the connective 

 tissue fibers. The differences in shape depended on the mechanical pressure 

 conditions. The difference in staining capacity of the nuclei was not consid- 

 ered a basis for cell classification. The fat in the testis was thought to be 

 brought there by the circulation and deposited, instead of being formed by 

 the interstitial tissue. No evidence was found in this study which would 

 indicate an internal secretion of any liind formed by interstitial tissue. There- 

 fore, it is concluded that there is no interstitial cell in the testis of the domestic 

 chicken in the sense that the term has been previously used. 



The iron content of the urine of domesticated animals, M. Reich (Das 

 Hanieiscn der Haustiere. Inaug. Diss., Univ. Rostock, 1911, pp. Ifl; rev. in 

 Zcntbl. Agr. Chem., J,l {1912), No. Ji, pp. 212-215).— hi normal feeding the 

 amount of Iron excreted per kilogram of urine was as follows: Dogs from 1.1 

 to 1.42, swine from 1.3 to 1.58, oxen 0.918. goats 0.498, horses from 0..51 to 0.83, 

 and sheep from 0.73 to 1.34 mg. The amount excreted per day for animals was 

 as follows: Dog 0.33. swine 5, oxen 12.55, goats 0.5, and sheep 1 mg. As in 

 the case of man the iron was in inorganic compounds. 



The discordant results of many investigators is thought to be due to imper- 

 fect methods of determination. The author used a modification of the methods 

 of O. Walter and H. Neumann. 



Department of experimental evolution, C. B. Davenport {Carnegie Inst. 

 Washington Year Book, 10 {1911), pp. 18-81, pi. 1).—A report of progress made 

 on problems in heredity, evolution, and genetics, including work on the follow- 

 ing topics : Heredity in poultry, inheritance of double horn in sheep, reciprocal 

 crosses in relation to sex, theory of pure lines, quantitative studies of selective 

 elimination, influence of becoming feral on the development of the nervous 

 system of the domestic animal, and the relation between heredity and the 

 chemical action of pigment. 



The problem of the improvement of domesticated species, H. Boulakd 

 {Bill. Econ. Indo-Chine, n. ser., 15 {1912), No. 91, pp. Jfi9-i,91).—A discussion 

 of methods of selecting breeding animals, and brief notes concerning the an- 

 cestry of cattle. 



Production of pure homozygotic organisms from heterozygotes by self- 

 fertilization, H. S. Jennings {Amer. Nat., J,6 {1912), No. 548, pp. 481-491).— 

 The author ilhistrates with mathematical formulas how organisms may become 

 homozygotes when self-fertilized for many generations, if the number of sepa- 

 rable inheritable characters is not large. 



The formation of condensed correlation tables when the number of com- 

 binations is large, J. A. Harris {Amer. Nat., 46 {1912), No. 548, pp. J,ll- 

 .'/<S6"). — The author's aim in this article is to show how, in the case of relation- 

 ships involving a very large number of combinations, the chief advantages of 

 the correlation, but not the contingency, surface may be even more easily 

 realized than in the method already described (E. S. R., 25, p. 771). Illustra- 

 tions are given of this rapid method of carrying out the routine of a widely 

 applicable statistical process. 



Concerning a specimen of Bos primigenius, J. Felix {Sitzher. Naturf. 

 Gesell. Leipzig, 31 {1910), pp. 3.5-38, pi. 1). — This contains a description of 

 measurements of a perfect skull of B. primigenius. 



Progress in breeding in the State of Sao Paulo, Brazil, L. Misson {Ann. 

 GemUoux, 22 {1912), No. 8, pp. 458-508, pis. 24).— A. general account of the 



