ANIMAL PRODUCTION. 71 



article discusses the differences in the horn growth of the various British 

 bi'eeds, and reports exi^riments with the Herdwicli breed. 



" The development of horns In the males of a breed of sheep in which well 

 marked secondary sexual differentiation occurs (as manifested especially by 

 presence or absence of horns) depends upon a stimulus arising in the testes, 

 and this stimulus is essential, not merely for the initiation of the horn growth 

 but for its continuance, the horns ceasing to grow whenever the testes are 

 removed. 



" The removal of the ovaries from young ewes belonging to such a breed does 

 not lead to the development of definitely male characters, except possibly in 

 an extremely minor degree." 



The native sheep of Manche, G. Gaudot {Jour. Agr. Prat., n. ser., 23 (1912), 

 No. 10, pp. 308, 309, pi. 1). — The characteristics of the sheep in the department 

 of Manche, and in pnrticular the native breeds found in the region along the 

 shores of the English Channel, are describe<l. 



The sheep of the Roman fields, B. Bianchini (Gior. R. Soc. Naz. Vet., 59 

 {1910), Nos. 51, pp. 1218-1223; 52, pp. 1252-1256; 53, pp. 1265-1269; 60 (inH), 

 Nos. 5, pp. 108-112; 6, pp. 123-127; 7, pp. l.',5-lli8; 8, pp. 175-179).— X descrip- 

 tion of the types of sheep, both native and introduced, with a view to their 

 iniiH'ovenient by better breeding and management. 



Grazing- farms, W. G. Brown (Queensland Agr. Jour., 28 {1912), No. 2, pp. 

 98-101). — Estimates are given of exi)enditures and returns on a 20,000-acre' 

 sheep ranch in Queensland. 



Iceland wool, A. E. Ingram {Daily Cons, and Trade lipts. {IJ. S.^, 15 {1912), 

 No. 82, p. 89). — This gives the amount and value of exports of Iceland wool to 

 the United States and Great Britain, and recommendations for preparing and 

 grading wool for export. 



Algerian wool {Bitl. Off. Oonvt. G^n. Alg6He, 1911, No. l.), Sup., pp. 207- 

 2/(7 ; abs. in Internat. Inst. Agr. [Rome], Bui. Bur. Agr. Intel, and Plant Dis- 

 eases, 2 {1911). No. 7, pp. 1725. 1726). — Statistical data on the wool production 

 in Algeria since 1S70 are rejwi'tofl. 



A few observations on birth of goats, Albrecht {Miinchen. Tierdrztl. 

 Wehnsehr., 55 {1911), Nos. 29, pp. ff81-/i85 ; 30, pp. .501-506).— These articles 

 rei)ort data on birth weight and after-birth weight, the i*elation of these 

 weights to each other and to the weight of the mother, and the length of the 

 parturition period. 



A cage for metabolism experiments on goats, A. R. Rose ( Bioehem. Bnl., 

 1 {1911), No. 2, pp. 222-226, pi. i).— This is a more detniled description of a 

 contrivance previously noted (E. S. R., 26, p. 26.S). 



Breeds of pigs suited for breeding on a small scale, Schwarz {Arh. Landw. 

 Kammer Pommern, 1911, No. 22, pp. 22; ahs. in Internwt. In^st. Agr. [Rome], 

 Bui. Bur. Agr. Intel, and Plant Diseases, 2 {1911), No. 6, pp. 1^10, Ull).— 

 This contains brief descriptions of breeds of pigs raised in Germany, with 

 methods of feeding and breeding. 



Chinese pork for export, R. S. Greene et al. {Daily Con,s. and Trade Rpts. 

 [U. S.], 15 {1912), No. 101, pp. 390-393) .—This consists of brief reports from 

 several consulates. 



The feeds commonly used to produce pork for export consist largely of by- 

 products of the rice mills, soy-bean oil factories, breweries, and distilleries. 

 The pork is stated to be of good quality and not more subject to disease than 

 that produced elsewhere. Hankow is the center of the export trade in hogs, 

 but it is stated that the finest pork comes from the province of Yunnan. 



50696°— No. 1—12 6 



