170 EXPERIMENT STATION EECORD. 



This is a continuation of work previously noted (E. S. R., 26, p. 262). In the 

 feeding of urea to dogs and swine, the results indicated that although there 

 was a heavy loss of nitrogen there was some nitrogen retention in the animal 

 body. 



Nutrition of the embryonic chick, I, II, III, H. W. Bywaters and W. B. 

 Roue (Jour. Physiol., 45 {1913), No. 6, pp. XL, XLI ; 46 (1913), Nos. 2, pp. XX, 

 XXI ; 3, pp. XXXIII, XXXIV). — Investigations made of the changes occurring 

 in the white of the egg during incubation indicate that the percentage of water 

 diminishes at a regular rate during the earlier period of incubation, falling 

 less regularly after the fifteenth day. There was less absorption of the protein 

 than of the water. The ratio of coagulable to uncoagulable protein remains 

 practically constant, ranging from 1 : 5.7 to 1 : 7.9. The presence of free sugar 

 usually disappears after the seventh day, whereas in infertile eggs it slightly 

 increases. The relation between the uncoagulable protein in egg white and its 

 combined carbohydrate after different periods of incubation was found to be 

 practically constant. 



The average daily loss in weight of eggs during incubation was about 0.5 gm. 

 It was fairly constant in the same egg, but varied greatly in different eggs. 

 " In the case of sterile eggs, the daily loss in weight for the same egg is prac- 

 tically constant throughout the whole period of incubation, [but] with fertile 

 eggs, the daily loss may fall slightly until about the middle of the period of 

 incubation and then it begins to rise until at the end it may be half as much 

 again as at the commencement of the incubation." It is deemed possible to 

 ascertain the fertility of the incubating egg by studying the daily loss in weight. 



It is shown that as regards the assimilation of egg white the ratio of the 

 coagulable to the uncoagulable protein, i. e., of albumin to ovomucoid, remains 

 practically constant. This is explained on the assumption that "the proteins 

 of egg white are absorbed at the same relative rate, possibly by being previ- 

 ously converted into diffusable substances by enzyms secreted by the embryo 

 itself." 



A respiration apparatus for sheep and swine, F. Tangl (Kis4rleP. Kozlem., 

 16 (1913), No. 4, pp. 467-481, figs. 7). — A report of the construction of a respira- 

 tion apparatus combining the principles of the Pettenkofer-Voit, Atwater-Bene- 

 dict, and Tigerstedt apparatus. 



Twenty- five years of German animal production, Hansen (Illus. Landw. 

 Ztg., 33 (1913), No. 48, pp. ^42-^^4, figs. 4). — ^A resume of the progress of animal 

 breeding and production in Germany, in which it is shown that there has been 

 an increase in the number of horses of 28.2 per cent, of cattle 27.7 per cent, of 

 mutton sheep 137.7 per cent, and of goats 28.1 per cent, with a decrease in wool 

 sheep of 69.8 per cent. 



Methods of cajttle raising and management under modern intensive farm- 

 ing (Arl). Deut. Oesell. Ziichttingsk., 1913, No. 17, pp. 70-93).— This is a com- 

 plete review and discussion of the methods of cattle raising in operation in the 

 Province of Saxony and portions of Prussia under the modern intensive farm- 

 ing system. The use of home-grown feeds and of barn feeding are emphasized. 

 The financial cost, yields, and profits are itemized and discussed in detail. 



Treatise on zootechny. — III, The bovine, P. Dechambre (Trait6 de Zoo- 

 technie. — III, Les Bovins. Paris, 1913, pp. 581, pi. 1, figs. 90). — In this volume 

 the author considers in detail the classification, origin, development, and breed 

 characteristics of all the common breeds of cattle as well as of many rare and 

 obsolete breeds of Europe, Asia, and South America. A special study is made of 

 the conformation, body measurements, and ethnological characters of these 

 breeds. There is also included a discussion of the production of beef in France, 



