1917] ANIMAL PRODUCTION. 471 



The experiments showed that the addition of the strong coffee infusion to a 

 purin-free diet caused a marked increase in the excretion of uric acid. 



The addition of a commercial decaffeinated coffee to a purin-free diet did not 

 cause any increase in the excretion of uric acid. If, however, caffein was 

 added to this preparation the excretion of uric acid was increased decidedly, 

 as was the case with coffee. The effect of adding tea to the purin-free diet 

 was similar to that of adding coffee to the same diet. The increase in the 

 quantity of uric acid excreted after the addition of coffee, tea, or caffein to 

 the purin-free diet seemed to be proportional to the quantity of caffein ingested 

 and was equal to the quantity of uric acid which would be obtained by the 

 demethylation and subsequent oxidation of from 10 to 15 per cent of the ingested 

 caffein. 



The action of xanthin and methyl xanthins on the isolated intestine, W. 

 Salant and E. W. Schwartze (Proc. Soc. Expt. Biol, and Med., 14 (1916), No. 

 1, p. 15). 



The action of succinate, malate, tartrate, and citrate on the isolated in- 

 testine, W. Saxant, C. W. Mitchell, and E. W. Schwaktze (Proc. Soc. Expt. 

 Biol, and Med., U (1916), No. 1, pp. 16, 17). 



ANIMAL PRODUCTION. 



How feed inspection helps the farmer, W. H. Strowt) (Wiscoiwiin Sta. Bui. 

 281 (1917), pp. 56, fig. 1). — Information with reference to feeding stuffs is sum- 

 marized and analyses are given of cottonseed meal, cottonseed feed, linseed 

 meal, gluten feed, com oil meal, distillers' grains, hominy feed, corn feed meal, 

 wheat bran, wheat middlings, red dog flour, germ middlings, oat middlings, 

 rye middlings, rye bran, rye shorts, barley shorts, brewers' grains, malt sprouts, 

 vinegar grains, alfalfa meal, bone meal, meat meal, meat scrap, tankage, dried 

 beet pulp, screenings, and mixed and proprietary feeding stuffs. 



How to feed live stock successfully, C. A. Wilt.son (Tennessee Sta. Bui. 

 116 (1916), pp. 49-106, figs. S; Col. Agr. Univ. Tenn., Ext. Div. Puh. 24 (1917). 

 pp. 58, figs. 8.) — This popular treatise upon live-stock feeding discusses the 

 traits of a successful feeder, principles to be considered in the feeding of farm 

 animals, limitations as to the amounts of fe^d that should be given under 

 various conditions, general rules for comparative valuations of feeding stuffs, 

 balanced and standard rations, how to balance a ration, and the feeding of 

 various kinds of live stock and poultry. The appendix gives in tabular form 

 from sources already noted the average composition, digestible nutrients, and 

 fertilizing constituents of American feeding stuffs, modified Wolff-Lehmann 

 feeding standards, manurial values of farm products, fertility removed per 

 acre by various farm crops, weights and measures of feeding stuffs, and sug- 

 gested rations for beef and dairy cattle, horses, and mules. 



How live stock is handled in the blue-grass reg'ion of Kentucky, .7. H. 

 Arnold (U. 8. Dept. Agr., Farmers' Bui. 812 (1917), pp. 14). — This discusses 

 the importance of knowing the best practice, what the blue-grass region farmer 

 may do to increase his profits through live stock, utilization of waste products by 

 means of animals, and feeding practice and cost of feed for different kinds of 

 animals common on blue-grass farms, and presents analyses of the business on 

 six individual farms. These farmers made beef cattle their leading stock 

 enterprise, keeping sheep and hogs principally to utilize materials that other- 

 wise would be wasted. 



A study of the rate and economy of g'ains of fattening- steers, H. W. Muxr- 

 FORD, H. S. Grindley, a. D. Emmett, and S. Bull (Illinois Sta. Bui. 197 (1917), 

 12883°— 17— No. 5 G 



