360 EXPERIMENT STATION RECORD. 



rest to work and that there is a change opposite in character when work follows 

 rest. 



Fasting studies: V, Studies on water drinking. — XI, The influence of an 

 excessive water ingestion on a dog after a prolonged fast, P. E. Howe, H. A. 

 Mattill, and P. B. Hawic (Jour. Biol. Cherii., 10 {1911), No. 5, pp. 417-432).— 

 Exijerimeutal data are reported in continuation of the authors' studies of fast- 

 ing and of water drinking (E. S. R., 25, pp. 268, 572). The total nitrogen values, 

 considered in connection with the values for creatin nitrogen and total pnrin 

 nitrogen, the authors believe " furnish strong substantiation for the hypothesis 

 that the increased nitrogen output associated with increased water ingestion 

 is due to a true stimulation of protein catabolism rather than to a flushing of 

 the tissues." 



The influence of underfeeding on the blood, A. E. Boycott and R. A. 

 Chisolm (Jour. Path, and Bad., 16 (1911), No. 2, pp. 263-268).— From ^experi- 

 ments with small animals (rats) the following conclusions were drawn: 



" Underfeeding with a diet deficient in proteid does not necessarily cause any 

 wasting of the blood. It is suggested that this result throws some light on the 

 duration of life of red cells in the circulation." 



Calorific values of urine, C. Vai.l6e {Compt. Rend. Sac. Biol. [Paris^, 11 

 (1911), No. 32, pp. 458-4G0). — A study of the energy value of urine; particularly 

 that from a meat diet, an ordinary mixed diet, and a lacto-vegetarian diet. 



The force used in mastication in relation to the strength, and health of the 

 peridental membrane, G. V. Black (In A tvork on operative dentistry. — /, The 

 patliology of the hard tissues of the teeth. Chicago an4 London, 1908, vol. 1, 

 pp. 161-171, pis. 2). — Instruments and methods are described and the results of 

 experiments reported. 



The power of the human jaw (Sci. Amer., 105 (1911), No. 23, p. Jf93, figs. 

 5). — A summary of investigations of the work expended in biting and chewing 

 food, carried on by Dr. G. V. Black (see above). 



ANIMAL PRODUCTION. 



Investigations on the changes in the nutritive value of feeds by fermen- 

 tation in the silo and the accompanying loss in digestibility, F. Tangi. and 

 S. Weisee {Landto. Vers. Stat., 7 J, (1911), No. 3-5, pp. 263-3-',2; aU. in ZentU. 

 Agr. Chem., 40 (1911), No. 9, pp. 62 1 -627). —When gi'eeu alfalfa was put into an 

 imwalled pit in July and taken out in March the weight had decreased from 

 ?.0,000 to 20,010 kg. The outer layers were more or less moldy, and in some 

 places the silage was partially charred. The analysis of the green alfalfa was 

 as follows : Water 13, crude protein 14.55, pure protein 12.05, fat 3.38, fiber 20.65, 

 and nitrogen-free extract 42.67 per cent, and energy in 100 gm., 390.1 calories. 

 The analysis of the silage was water 48, crude protein 10.62, pure protein 7.2, fat 

 1.63, fiber 10.31, and nitrogen-free extract 24.98 per cent, and energy in 100 gm., 

 235.6 calories. On a dry matter basis there was an increase in amids, pure 

 protein remained the same, and there was a loss in all other nutrients. 



In metabolism experiments with wethers it showed a loss in digestibility in 

 all constituents. The digestion coefficients of the green alfalfa were crude 

 protein 74.5, pure protein 71.7, fat 528, fiber 42.1, and nitrogen-free extract 

 63.9 per cent; of the silage, crude protein 48, pure protein 29.8, fat 44.9, fiber 

 o8.2, and nitrogen-free extract 52.7 per cent. 



Beet leaves and tops when siloed in a stack on the gi-ound in October contained 

 6,556 kg. of dry matter, which at the end of January had decreased to 5,822 kg. 

 The analysis of the fresh material was water 79.64, ash 4.05, crude in-otein 

 3.16, pure protein 2.14, amid 1.02, fat 0.48, fiber 2.3. nitrogen-free extract 10.38, 



