108 EXPERIMENT STATION RECORD. 



ill I'oriiiiiij,' etliyl ))utyrate. In the experiments a glycerin extract of lipase from the 

 pancreas, prepjxred l)y macerating p(jrtions of the organ and (^training through cloth, 

 was used. Filtering through filter paper almost completely removed the en/ym. 

 The enzym was found to be more stable than usually supposed and its action was 

 strongest at 40° C, while it was destroyed at 65 to 70° C. 



In studying the effect of lipase on ethereal salts of a homologous series, it was 

 found that the stability of the latter decreases with the increase of the molecular 

 weight of the combined acid. 



With concentrated amounts of the enzym or with small amounts of ethereal salts 

 hydrolysis was complete. The authors believe that under other conditions the 

 hydrolizing action of the enzym stops and its action under favorable circumstances 

 is reversed. Experiments are described, wherein ethyl butyrate was formed from 

 butyric acid and alcohol by the action of lipase. The trials were carried on with 

 control experiments and the presence of the butyrate detected h\ its odor. About 

 5 per cent of the butyric acid was changed into ethyl butyrate. The l^earing of this 

 result on fat a1)Sorption, storing, and translocation in the plant is discussed. 



The question of the resorption of fat, I. Munk {Centhl. Physiol., U {1900), pp. 

 13 1-1S5, 153-156; abs. in ZUchr. Untcrmch. Nahr. u. Genussmtl, 4 {1901), No. 5, p. 

 205). — A controversial article. 



Concerning tlie influence of butter on the secretion of gastric juice, W. A. 

 WiKsciriLi.o ( Vravli [>SV. Pdcrxlmr'j], 21 {1900), pp. 423, 424; ah^. in Zt^rlu-. Unhrxuch. 

 Nahr. v. CUnmssmtl., 4 {1901), No. 5, p. 206).—T\\e principal conclusions, which were 

 drawn from experiments made with man in which the stomach contents were exam- 

 ined, follow: Butter diminishes the hydrochloric acid and pepsin of the gastric juice, 

 and hinders the secretion of the gastric juice less when first taken than after a time. 

 The peptonizing power is greater under the influence of butter than without it. 

 Butter diminishes the activity of the glands secreting gastric juice, and the secre- 

 tion does not continue longer than when no butter is consumed. According to the 

 observer butter should be given an imjiortant place in the diet of invalids on account 

 of its nutritive value, pleasant taste, and easy digestibility. 



Concerning the quantitative determinations of easily digested carbohy- 

 drates (starch and nearly related bodies) in the human feces, J. .STRAsiuKciER 

 {Arch. Physiol. iPfliiger'], 84 {1901), No. S-4, pp- 173-189).— As the result of investi- 

 gations, the author concludes that the small amount ot starch present in the feces 

 can be determined quantitatively with the Volhard-Pfliiger sugar method. 



The silica content of human and animal tissues, H. Schulz {Arch. Physiol., 

 [Pfluger], 84 {1000), No. 1-2, pp. 67-100; abs. in Chcm. Ccntbl, 72 {1901), I, No. 11, 

 p. 636). — Details of chemical investigations are reported. 



ANIMAL PRODUCTION. 



Bye as a concentrated feed, AV. von Kniekie.m {Landw. Jahrb.,29 {1900), No. 3, 

 pj>. 483-523). — Tests made at the Peterhof Experimental Farm on the value of rye 

 grain as a concentrated feed are reported and discussed. The investigations include 

 a test with milch cows, a feeding test with pigs, digestion experiments Avith horses, 

 sheep, rabbits and hens, and chemical and physiological studies of the fat of rye and 

 other feeding stuffs. 



Tests tvith coivs (pp. 484-491).— The first test reported was made by A. von Villon. 

 Two cows were fed during 3 periods from November 13 to February 12. The coarse 

 food was 30 lbs. of clover hay daily. During the second period 1 cow was fed in 

 addition 5 lbs. of malt dust, and another cow 5 lbs. of crushed rye daily. But little 

 change -was produced by the addition of grain to a ration of such nutritious coarse 

 feed as clover hay. The ration containing the malt dust appeared to have a more 

 favorable influence upon the production of milk than the ration with rye. 



