ANIMAL PRODUCTION, 771 



by a marked retention of cblorin in succeedinf; days. The lowering of the 

 chlorin content, according to the authors, is attributable to a disturbance in the 

 hydrochloric acid secretion in the stomach. 



Chemical constitution and physiological activity of alcohols and acids, II, 

 J. LoEB {Biochem. Ztschr., 23 {1909), No. 1-2, pp. 39-96).— lu the case of or- 

 ganic acids the author concludes that physiological activity increases with an in- 

 creased number of carbon atoms in the molecule but that the increased activity 

 is relatively uninijiortant. 



The fate of sodium, benzoate in the human organism, H. D. Dakin (Jour. 

 Biol. Chcm., 7 (19 JO), No. 2, pp. J 03-108). — According to the author's summary 

 of his investigations, " benzoic acid taken by men in doses of 5 to 10 gm. per day 

 for 2 or 3 days, in the form of sodium benzoate, imdergoes a practically com- 

 plete conversion into hippuric acid and is eliminated as such in the urine. Under 

 these conditions no free benzoic acid is excreted. There is no evidence of the con- 

 version of benzoic acid into any aromatic oxy-acid ; neither is there any evidence 

 of any material part of the benzoic acid undergoing complete combustion in the 

 animal body. With the doses of benzoic acid mentioned the increase in glycu- 

 ronic acid derivatives in the urine is trifling." 



An improved method for the estimation of hippuric acid is described. 



Energy relations and human physiology, W. Camerer {Jahrh. Kinderheilk., 

 70 {1909), No. .',, pp. 39 1-UO) .—Contmmn^ his digest of data on this subject 

 (E; S. R., 19, p. 768), the author presents controversial and critical data to- 

 gether with a summary of recently published material. 



The production of animal heat and the substituting value of nutrients, 

 G. Weiss {Rci: (Icii. HvL, 21 (1910), No. 1 pp. 19-26).— A discussion of foods 

 from the stnndiioint of ciuM-gctics. based on Ilubner's investigations. 



Concerning fatigue induced by rapid movements, A. Imbert {Campt. Rend. 

 Acad. Sci. [Farin], 1^9 (1909), No. 17, pp. 6S9, 690).— From the results of his 

 experimental studies the author concludes that rapid movements which do not 

 produce an appreciable quantity of external muscular work quickly induce 

 fatigue, which in certain subjects at least is very pronounced. 



ANIMAL PRODUCTION. 



Specific effects of rations on the development of swine, E. B. Forbes {Ohio 

 Sta. Bui. 213, pp. 239-303 ; Missouri Sta. Bui. 81, pp. 3-69). — Three experiments 

 in feeding swine at the Missouri Station during 1905 and 1906 are reported, in 

 which the importance of phosphorus and other ash constituents in rations for 

 growing animals was studied. 



In the first experiment wheat middlings, linseed meal, soy beans, tankage, 

 and germ oil meal were compared as supplements to corn in the dry lot for 

 fattening hogs for market. Thirteen lots of 5 grade Poland-Chinas each were 

 used. Analyses of the feeds are given, including the percentages of phosphorus 

 and lecithin. The results included the increased weight of leaf lard, kidney, 

 lung, heart, liver, spleen, tenderloin, and the chemical analyses of tenderloin 

 muscles and meat of the cross-sections of the cuts. 



" Where hogs were full-fed on these rations, the middlings ration was 23 

 per cent more efficient than corn alone, the linseed meal ration 32 per cent, the 

 soy beau ration 38.5 per cent, the tankage ration 32.6 per cent, and the germ 

 oil meal ration 17.6 per cent more efficient to cause gain in weight. 



" Where these six rations were fed in practically equal but somewhat re- 

 stricted amounts, the middlings ration was 28.9 per cent more efficient than 

 corn alone, the linseed meal ration 29.8 per cent, the soy bean ration 22.6 per 



