1010] ANIMAL PRODUCTION". 71 



The role of inorganic sulphates in nutrition, Amy L. DANIELS and Jean K. 

 Rich (.Jour. Biol. Chcm., 36 (WIS), No. 1, pp. 27-32, figs. 3; abs. in Chem. Ab8„ 

 tB (1018), No. 23, p. 2605). — Feeding experiments with rats to determine 

 whether the young animal is able to synthesize cystin from inorganic sulphates 

 are reported. Evidence is furnished that the inorganic sulphates can not be 

 used to replace the organically combined sulphur of cystin. 



Observations on the significance of glycolic acid, glyoxal, glycol aldehyde, 

 and amino-aldehyde in intermediary metabolism, I. Greenwai.d (Jour. Biol. 

 Chem., 35 (1918), No. 3, pp. 461-472; abs. in Chem. Abs., 12 (1918), No. 23 pp. 

 2608, 2609). — From experiments with phlorhizinized dogs the author concludes 

 that it is highly improbable that glycolic acid and glyoxal are converted into 

 glucose in the body, but that it is probable, but not established, that glycol alde- 

 hyde may be converted into glucose. In regard to the significance of glycin and 

 aniino-aldehyde in intermediary metabolism, the possible sequence is suggested 

 of glycin «=±amino-aldehyde<=±glycol aldehyde <=±glucose. 



Hunger and appetite secretion of gastric juice in infants' stomachs, R. 

 Taylor (Amer. Jour. Diseases Children, 14 (1917), No. 4, pp. 258-266, fig. 1).— 

 An apparatus is described by which sham feeding can be carried out and gastric 

 juice collected under conditions which are said to give positive evidence of the 

 amount secreted. Experimental evidence obtained with this apparatus tends 

 to prove that there is no appetite or psychic secretion of gastric juice in the 

 infant. The empty stomach of the hungry infant was found to secrete a pepsin- 

 containing gastric juice which is often as acid as that found in the adult 

 stomach. The more profuse this secretion the higher is its acidity. 



Contribution to the study of digestive leucocytosis, P. Brodin and F. Saint- 

 Girons (Compt. Rend. Acad. Sci. [Paris], 166 (1918), No. 7, pp. 302-305).— A 

 study of digestive leucocytosis was conducted by means of the determination 

 of the number of leucocytes in the blood every half hour for six or seven hours 

 after the ingestion of different food materials. The results are summarized as 

 follows : 



In the normal subject digestion is constantly accompanied by modifications in 

 leucocytic equilibrium bearing upon the number of white corpuscles and the 

 proportion of polynuclears. The number of leucocytes decreases at first and then 

 increases, the largest number being found from two to three hours and again 

 from four to six hours after the meal. The proportion of polynuclears follows 

 a course almost parallel with that of the number of leucocytes. The modifica- 

 tions of the leucocytic equilibrium vary with each individual and. above all, 

 with the nature of the food, being most pronounced on a meat diet. This is 

 caused by the passage into the blood of ingested products. 



ANIMAL PRODUCTION. 



Feeding farm animals, W. E. Carroll (Utah Sta. Circ. 32 (1918), pp. 3-23). — 

 This circular constitutes a brief popular treatise on the feeding of farm animals, 

 discussing in particular the function of food nutrients, the digestion of feeds, 

 rations, and the relative value of feeding stuffs. Compiled tables are presented 

 showing the nutrient requirements for growth, fattening, milk production, and 

 work production, and the relative values of different feeding stuffs as based on 

 their content of digestible matter, net energy, and feed units, and also as em- 

 ployed in the feeding of the more common farm animals. 



Composition and digestibility of Sudan grass hay, W. G. Gaessler and 

 A. C. McCandlish (Iowa Sta. Research Bui. 46 (1918), pp. 65-75).— This has 

 been abstracted from another source (E. S. R., 39, p. 672). 



10462S"— 19 6 



