oh?:mistrv. 915 



acid. Roll up the filter ana contents and place in a Knoj)- Wagner azotonieter, adding 

 about 30 ce. of water, 0.5 gni. of crystallized hydrazin sulphate, and 10 cc. of a 10 per 

 cent solution of sodium hydroxid. The collection and measurement of the gas 

 evolved is carried o>it in the usual way. 



A contribution to the determination of phosphoric acid in organic sub- 

 stances, V. RiK(iKK {Zlsehr. PliiislLal. ('linn., .1} (i:>0/), j)j>. 109-113; (tbs. in Chem. 

 Centbl.. WOJ, I, No. 1, p. 67). 



Colorimetric method for determining- oxygen dissolved in water, W. R.\m- 

 s.wand Ida Homfray [Jour. Soc. Chem. lad., 20 {1901), No. 11, pp. 1071-1074, Jig. 1). 



A method for estimating fat, G. Rosenfeld {Chem. Ztg., 24 {1901), Repert., p. 

 250; abii. in Ztsdn: Utile r.'iurh. Xahr. u. Genussmtl., 4 {1901), No. 22, p. 1030). — Chlo- 

 roform is recommended instead of ether for extracting fat. The author states that 6 

 hours' extraction gives values which are comparable with those obtained by j)redi- 

 gesting the material and then extracting with ether. Higher values were obtained 

 if extraction was preceded by Ixiiling in alcohol for a short time. After evaporating 

 the chloroform the material remaining is placed for a short time in a drying oven, 

 thoroughly dried in a desiccator, and taken up with cool absolute ether as long as 

 any material is dissolved. On evaporating the ether only true ether extract remains 

 for weighing. The fats obtaineil by this and the ordinary method have different 

 iodin values. 



A test for the coloring matter of butter, J. Vandriken {Ann. Pliarm., 7 {1901), 

 pp. 110-117; (lbs. Ill Z/srJtr. ('ntrrsurli. Xahr. u. Gemmmtl., 4 {1901), No. 21, pp. 978, 

 979). — The author gives a method for testing the coloring matter contained in butter 

 by amyl nitrite. Butter without any artificial coloring matter is discolored, while 

 with a number of artificially colored fats, with one exception, the color was not 

 changed by the test. The manipulation was made as follow^s: Two cubic centi- 

 meters of filtered butter and a like amount of ether is treated with 6 to 10 drops of 

 amyl nitrite. 



On the temperature reaction of oils -writh sulphuric acid — Maumene's test, 

 H. C. Sherman, J. L. Daxziger, and L. Kotixstamm {.Tour. Amer. Chem. Soc, 24 

 (1902), No. 3, pp. 266-273). 



On the relation of the heat of combustion to the specific gravity in fatty 

 oils, H. C. Shermax and J. F. Sxell {Jour. Anwr. Chem. Soc, 24 (1902), No. 4, pp. 

 348-353). — "In fresh fatty oils the heat of combu-stion is a property quite as constant 

 as the specific gravity, to which it bears a certain definite relation. Oxidation result- 

 ing from exposure to air decreases the heat of combustion to practically the same 

 extent that it increases the specific gravity." 



A note on the use of the Bechi or silver nitrate test on olive oils, L. M. Tol- 

 -MAN (Jour. Amer. Chem. Soc, 24 (1902), No. 4, pj>- 396, 397} .— Before applying the 

 test the author recommends treating the sample successively with 95 per cent alco- 

 hol, 2 per I'ent nitric acid, and water. 



A study of the Bechi test for cotton-seed oil, A. H. (Jill and ('. H. Dennison 

 {Jour. Amer. Chem. Soc, 24(1902), No. 4, PP- --^97, 398). — Experiments seemed to 

 indicate that the test might be (hie to the presence of sulphur compounds. 



A study of some cotton-seed oils, J. B. WEEMsand H. N. Grettenberg {Reprint 

 from Proc Iowa Acad. Sci, 8 (1900), pp. 2). — The results are reported of the chem- 

 ical examination of 9 grades of cotton-seed oil, the figures representing 3 determina- 

 tions for each sample. The specific gravity ranged from 0.9003 to 0.900*), and 

 averaged 0.90045. The saponification equivalent varied from 192.1 to 198.6, averag- 

 ing 194.6, the better oils po.«ses.«ing the liigherand the common oils the lower values. 

 The better grades of oils gave lower iodin absorption numbers than the common, 

 and cru(L oils gave high results. 



The determination of starch in the cereal grains, Lindet {Bnl. Soc ('him. 

 Paris, 3. ser., 25 {1901), No. 24, )>}>■ 1055-1057). 



27718— No. 10-02 2 



