ANIMAL PRODUCTION. 179 



stead horse — a horse which iu its molars agrees with the small fossil Oreston 

 race, and in its cannon bones with the fine-limbed fossil horse of Kent's Cave. 

 Torquay." 



Measurements and illustrations are submitted which demonstrate the differ- 

 ence between the species discussed. 



On the fertility of the hybrids of the domestic horse. — The zebroids and 

 hybrids of the horse and Equus przewalskii, I. Ivanov {Izi\ Imp. Akad. Nauk 

 (Bui. Acad. Imp. Sci. S!t. Petersh.), 6. ser., 1910, No. 10, pp. 77^-77// ) .—Micro- 

 scopical examinations were made of the seminal fluid, collected by the sponge 

 method, of a zebroid horse hybrid raised at the Askania Nova park, and found 

 to be free from spermatozoa, contrary to Ewart's observations. Both sexes 

 were fertile in offspring from crosses between the domestic horse and E. 

 pr::eivalskii and the spermatozoa were similar in form to those of the domestic 

 horse. 



Zebras and zebroids, E. Trouessart (Nature [Paris], 38 (1910), No. i,9////, 

 pp. 194-198, figs. Jf). — An account of the zebras and zebra hybrids in the Museum 

 of Natural History of Paris. 



[Color correlation in the hair and hoof], Dupon (Mar4ch. Franc, 1909, No. 

 653; abs. in Jahrh. Wiss. u. Prakt. Tierzucht, 5 (1910), pp. 328, 329).— From 

 careful observations of many animals the author thinks there is a correlation 

 between coat color and hoofs. The hoofs of black and of red horses are often 

 brittle and dry, while in gray and roan horses the horn of the hoof is usually 

 gray in color and of better quality. Horses with white feet usually have a 

 white horn, which is less liable to injury from atmospheric influences and from 

 shoe nails driven into the horn while shoeing. 



On the inheritance of color in the American harness horse, A. H. Sturte- 

 VANT, Jr. (Biol. Bui. Mar. Biol. Lai). Woods Hole, 19 (1910), No. 3, pp. 20^- 

 216). — A discussion of the pigments present in the coat color of horses, and a 

 report on the study of the inheritance of coat color obtained from an examina- 

 tion of the oflScial records of the pedigrees of blooded trotters. The chestnut 

 factor which was present in all cases was hypostatic to black ; black was 

 hypostatic to bay, roan, or gray. The relation of roan and gray to each other 

 was uncertain, but either one of them is epistatic to bay. 



Points of a Clydesdale draft horse, P. R. Gordon (Queensland Agr. Jour., 

 23 (1910), No. Ji, pp. 213-215, pis. 2). — A detailed statement by an expert judge 

 of the Clydesdales in Queensland of the score-card used, which differs from 

 most of those used in the United States because pedigree and offspring count 

 for 8 points each. 



The origin of the Percheron horse, A. Gallier (Jour. Agr. Prat., n. ser., 

 18 (1909), No. 32, pp. 209-211, fig. 1; ahs. in, Jahrb. Wiss. u. Prakt. Tierzucht, 5 

 (1910), p. 286). — As the author does not find any record in the seventeenth or 

 eighteenth centuries of a horse resembling the Percheron, he considers it a new 

 breed resulting from a cross between a large Norman and the oriental horse, 

 influenced somewhat by food, climate, and selection. 



Breeding horses for use, or equine eugenics, F. Ram (London, 1909, pp. 

 19). — The author contends for a more rational method for selecting breeding 

 stock if horses are to be improved. It is emphasized that horses for the English 

 army should be selected for hardness and capacity for service rather than on 

 the present-day empirical methods of judging by unimportant " points." 



Report on horse breeding, Granard et al. (Ri)t. Roy. Com. Horse Breeding 

 [01. Brit.], 12 (1908), pp. XIV+l^; 13 (1910), pp. i9).— These reports recom 

 mend measures that should be undertaken by the government for the improve- 

 ment of horse breeding. 



