566 EXPERIMENT STATION RECORD. 



The energy required for the work of digestion, (). Cohniieim (ArcJi. Hi/g., 

 .77 (V.KIG). Xi). .',, !>[). J/Ol-'iLS). — Digestion rtniuircs more energy production 

 than hunger, the amount measured in the experiment reported being 3.3 calories 

 equivalent to (l.!)8 gm. carbon dioxid or 0.35 gm. fat, an increase of 9 per cent of 

 the mininmm energy metabolized per day at rest aud in a warm room, and not 

 over 1 per cent of the output of energy per day under normal conditions. This 

 increase is due to the work of the digestive organs. The total nitrogeu ex- 

 cretion was not increased. It appears, therefore, that the work of digestion, 

 like muscular work, is carried on at the expense of nitrogen-free nutrients. 



The digestion of protein and its function in general nutrition, Lambling 

 {Rev. ,Sci. [Paris], J. .ser., 6 {1006), .To. IS, pi). 5.'/5-551). — A summary and dis- 

 cussion of recent work pertaining to the cleavage and digestion of pi'oteids. 



Peptic digestion, P. Met {Ztsclir. Phijsloh CJicm., J/8 {1906), No. 1, pp- 

 SIS-'/). — The alliuminoses formed in gastric digestion can be almost completely 

 precipitated by the use of tannin, a peptone remaining in the filtrate. 



The effect of different substances upon artificial peptic digestion, J. von 

 Fu.TiTANi {Arcli. Jiitcnxit. Phitnnacoil. ct Thcr.. l.) {1905). p. 1; (ihs. in Hyg. 

 Rundschau, 16 {191)6), Xo. 19, pp. 1IIS3, 1084). — Among the nniterials studied 

 were tea, coffee, and sugar products. 



Tea and coffee in concentrated solution were found to have an unfavorable 

 effect upon peptic digestion directly proportional to the degree of concentration. 

 Apparently the caffein present did not exercise any effect upon digestion. Sugar 

 solutions of over 0..1 ])er cent concentration had a retarding effect upon digestion. 



New conrparative studies of natural and artificial digestion of protein, 

 W. RoTHE. II. WAN(ii\iCK, and A. Stutzek {-lour. Landir.. .i '/ (1906). pp. 2-')l- 

 26-'i). — The same results were obtained in artificial digestion experiments as in 

 the natural experiments with rabbits, the feeding stuffs used being wheat, bran, 

 and meadow ha.v. 



Muscular work and protein metabolism, W. Saw.jalow {Ztsclir. Physiol. 

 Chem., .'i8 {1906)', Xo. 2, pp. .s'.), .S7;). — An examination of liquid which was 

 passed through isolated cat and rabbit hearts kept at work from 1 hour and 30 

 minutes to 2 hours and 30 minutes showed that it was almost entirely free from 

 ammonia and from urea. This led to the conclusion that muscular work was 

 apparently ]ierformed without the cleavage of protein. 



The physiology and pathology of mineral metabolism, with tables showing 

 the ash constituents of foods, condiments, and mineral waters, A. Alhu and 

 ('. Neuberg {Physiologie und Pathologic des UineralstoffiDechscls nehst Tahellen 

 iiher die lilineralstoffzusammensetzung der menschlichen Xahrnngs- und Gennss- 

 mittel soicie der Miner alhrumien und- lU'idcr. Berlin: Julius Springer, 1906, 

 pp. 2-'i7 : rev. in Zenthl. Gesam. Physiol, u. Path, f^tofficechsels, n. ser.. 1 {1906), 

 No. l.'i, p. 'pl'i). — Among the subjects considered in this handbook are the water 

 and ash content of the human body, the ash content of different organs, blood, 

 and secretions; the dynamics of salt action; the physical-chemical action of 

 salts; metabolism of calcium, magnesium, and other individual ash constituents; 

 iodin, arsenic, and other elements occurring in small (luantities; the therapeu- 

 tics of ash constituents, and a critical discussion of methods of ash analysis. 

 The tables contain a summary of data which the authors consider reliable, sup- 

 ]tlemented by the results of many original analyses. 



As a whole, this volinne constitutes a useful handbook on a subject on which 

 hitherto infoi'uiation has been inadequate and widely scattered. 



Infiuence of the quality and quantity of protein consumed upon the 

 elimination of uric acid xanthin compounds in normal man, LI. Labbe and 

 F.. Furet {Compt. Rend. Hoc. Biol. {I'aris]. 61 {1906), No. 21, pp. 21.'/-216).— 

 Experiments showed that the amount of uric-acid xantho bodies produced fi'om 



