ANIMAL PRODUCTION. 767 



ill normal health were subjects, i>erspiratiou being collected from the face, 

 the arm, and the lower leg by means of glass tubes fastened to the body with 

 rubber tissue. 



The face apparently secreted sweat most abundantly. The amount of sodium 

 chlorid contained iu sweat was directly proportional to the rate of secretion. 

 Temperature, humidity, muscular activity, baths, psychic influences, and other 

 conditions exercised only an indirect influence on the salt content, but a per- 

 ceptible increase in the amount of salt taken iu food produced a corresponding 

 increase in the salt excretion in perspiration. 



Under ordinary conditions sweat is acid in reaction, the acidity increasing 

 when the secretion is heated. In general, the arm yielded the most acid 

 l)erspiration and the lower leg the least acid of the sam]iles studied. Muscular 

 activity, baths, and other means of increasing perspiration have no direct influ- 

 ence upon acidity. 



ANIMAL PRODUCTION. 



The interpretation of the results of feeding experiments, T. B. Wood (Jour. 

 Bd. Affi: [London], Sup. 7, 1911, Nov., pp. 32-37). — A method of determining 

 the probable error of feeding trials is discussed, and examples of its use iu 

 interpreting the results ;ire cited. .See also a previous note (E. S. K., 24, p. QSo). 



The results of 2 feeding trials with sheep, in which concentrated cakes were 

 compared, were inconclusive. Combining the results of 3 trials, which included 

 .*>8 animals for each food, it was found that a mixture of decorticated cake and 

 barley gave 9.1 per cent greater increase iu live weight than linseed cake. 

 The probable error on this increase was 3.1 per cent. The difl'erence was 2.9 

 times the probable error, which corresponds to odds of 20:1. Therefore, the 

 author states that the conclusion that a mixture of decorticated cake and barley 

 is a better food for sheep than linset^d cake is justified. 



The theoretical foundations of the principles of feeding, Kleberger 

 (I'iiltlinf/.s Landw. ZUj., 61 {Id 12), No. /, /*/). l!)-26). — A brief historical resume 

 of the progress made in experimental studies of the nutritive value of feeding 

 stuffs, with special reference to the work of Kellner. 



The beet sugar industry and live stock production, AV. I^. Petrikin 

 (Denver [1911], pp. I'l). — Attention is called to the advantages of utilizing 

 waste products of sugar beets for feeding domesticated animals. Samples of 

 rations containing beet pulp are given. 



Feeding experiments with cattle and sheep, 1910—11, D. A. Gilchrist 

 (Count!/ North unib. Ed. Com. Bui. 17, 1912, pp. 17). — When young cattle were 

 fed a larger proportion of protein than called for by the Wolff-Lehmann stand- 

 ard somewhat faster gains were made but at less profit. Decorticated cotton 

 cake as a concentrate caused slightly faster gains than soy-bean cake, but in 

 one experiment was less economical. In a feeding test with sheep, when maize 

 meal and straw were substituted for swedes, the gains were more rapid but the 

 cost of gain was increased. Analyses of meadow hay, straw, swedes, soy cake, 

 decorticated cotton cake, and Bombay cotton cake are given. 



On the spontaneous heating of hay, H. Miehe {Arb. Dent. Lan&w. Gesell., 

 1911, No. 196, pp. 36, figs. 3; ahs. in Jour. Bd. Agr. [London], 18 (1912), No. 11, 

 pp. 9.'i4, 9-'i5). — Up to 40° C. heating the hay stacks was found to be due chiefly 

 to Bacillus coli, but if the grass was not quite dead the first stage was caused 

 mainly by respiratory activity. From 40 to 75° B. caJfuctor was mainly respon- 

 sible; above 75° the heating was purely chemical. O'idiuin lactis and Aspergil- 

 lus niger were also found to assist in the production of heat. 



[Analyses of feeding stuffs], R. E. Rose and E. P. Greene (Fla. Quart. 

 Bui. Dept. Agr., 22 (1912), No. 1, pp. 72-9-'t). — Analyses are reported of wheat. 



