376 EXPERIMENT STATION EECOED. [Vol.35 



The lambs of lot 1 returned a profit of $1.03 per head, and those of lot 2 

 82 cts. per head. 



The influence of domestication on the mechanical qualities of the pars 

 compacta of Sus scrofa domestica, together with a discussion of the theory 

 of the functional adaptation of the skeleton, A. Schmidt {Arch. EnPwicM. 

 Mech. Organ., U {1915), Nos. S, pp. 4^2-534, pis. 2, figs. 5; 4, pp. 605-671, figs. 

 8). — Data are given on the moduli of strength of the compact bone substance 

 of wild and domestic swine. 



In general, grazing animals show a higher modulus of elasticity and a 

 greater firmness than those of the same age not on pasture. The specific 

 gravity of the compacta of S. scrofa domestica undergoes various changes. In 

 the metatarsal bones of the .young and the tibial and metatarsal of older wild 

 swine it is much higher than for domestic swine of the same age. The specific 

 gravity of the compacta of Sus and Cervus is lower in the metatarsus than 

 in the tibia. 



A bibliography of references is included. 



Physiology and bacon curing, K. J. J. Mackenzie and F. H. A. Marshall 

 {Jour. Roy. Agr. Soc. England., 16 {1915), pp. 1-13). — It is stated that the 

 black pigment so often found in the mammary area of sows belonging to 

 colored breeds is in no way related to sexual changes occurring during the 

 period of heat or oestrus. On the other hand, it is closely similar to, or identical 

 with, the pigment of the hair, and is consequently harmless. It follows that 

 the heavy losses sustained by bacon manufacturers owing to the presence 

 of this pigment have been incurred unnecessarily. 



Experiments have shown that the results of ovariotomy are such as to 

 justify the operation being carried out for commercial purposes, since spayed 

 sows tend to feed better and fatten faster than open or unoperated ones. 

 Those cases in which sows which were supposed to have been spayed have 

 behaved as though they were open are the result of faulty operating. 



The breeding and feeding of pigs for bacon factory purposes, R. C. Sim- 

 mons {Rhodesia Agr. Jour., IS {1916), No. 2, pp. 187-214, pis. 2, figs. 3).— A 

 general discussion of the type of pig required for bacon production, and of 

 methods of feeding, care, and management, together with a number of suggested 

 rations. 



Feeding potatoes to fattening swine, W. Voltz {Deut. Landw. Presse, 42 

 {1915), No. 91, pp. 771-773, figs. 8).— It was demonstrated that it is not feasible 

 to feed potatoes alone to growing and fattening swine, a protein supplement 

 being essential to satisfactory' development. 



Feeding experiments with straw meal and cellulose material, Schneide- 

 wiND {Landic. Wchnschr. Sachsen, 18 {1916), No. 7, pp. 57-59). — The addition of 

 a cellulose feed, composed of 65 per cent of straw material, 20 per cent of dried 

 potatoes, and 15 per cent of molasses, to the ordinary grain ration for swine 

 proved to be a valuable supplement, materially increasing the gain over a grain 

 ration alone. 



Feeding pigs on the subcutaneous matter of hides intended for tanning. 

 W. Ellenbergek and W. Grimmee {Berlin. Tierdrztl. Wchnschr., 31 {1915), 

 No. 32, pp. 373-378) .—The authors conducted experiments in feeding the sub- 

 cutaneous matter of hides to swine. This feed was well liked by the pigs and 

 produced normal development. It was found to be an excellent concentrated 

 feed, equal in nutritive value to a mixture of crushed beans and vetches. The 

 digestability of the protein was 21 per cent and the starch equivalent 76.4 per 

 cent. The flesh of the swine was found to be normal in composition. The 

 meat when cooked had an excellent flavor and in no case was any disagreeable 

 taste detected, whether raw or cooked. 



