AGEICULTURAL CHEMISTKY AGROTECHNY. 507 



" The improved method usually gives higher figures thau the official method. 

 In general the results check, one with another, more satisfactorily, and the 

 method is very much easier to use." 



Tests were made with cowpeas, linseed meal, corn meal, soy beans, dis- 

 tillers' grains (corn), oats, wheat bran, wheat grain, patent flour, gluten feed, 

 and cotton-seed meal. 



A rapid control method for the determination of oil in grains, E. P. 

 Habding and Lillian L. Nye {Jour. Indus, and Engin. Chern., 4 {1912), No. 12, 

 pp. 895-S97).— The method consists of extracting the grains with carbon tetra- 

 chlorid (boiling i)oint 76° C), cooling the mass, mixing with absolute alcohol, 

 distilled water, and distilled petroleum ether (boiling point 53 to 68°), and 

 then shaking thoroughly ; it is then whirled in a centrifuge, the oil blown off, 

 filtered into a tared flask, and dried to constant weight on a water bath. The 

 time required for the entire operation is 3 hours. 



" The apparatus used is a thick-walled glass cylinder, 7i in. long and li in. 

 in diameter, a water bath, a reflux condenser, a condensing tube, a centrifuge, 

 a blow-off tube .similar to that used with a Werner-Schmidt apparatus, a 

 Soxhlet extractor provided with a glass stopcock connected to a reflux con- 

 denser, a receiver, a casserole 5 in. in diameter, a flask 2i in. bottom diameter 

 by 4 in. in height, and a small fimnel." 



A rapid and accurate gravimetric method for determining milk fat in 

 evaporated milk and milk powders, E. P. Harding and G. Parkin {Jour. 

 Indus, and En^in. Chem., 5 {WIS), No. 2, pp. 131-134). — Various modifications 

 of the Babcock method which have been suggested as giving reliable results 

 with condensed milk products were tried, special emphasis being given to the 

 modifications of Leach (E. S. R., 12, p. 823), and of Hunziker and Spitzer 

 (E. S. R., 21, p. 412). These methods not only gave too low results but also an 

 impure fat and a fat column very difficult to read. Of the gravimetric methods 

 in use, the Werner-Schmidt method and Rose-Gottlieb methods gave the most 

 reliable results, although not absolutely correct in every case. 



" The direct extraction methods like Adams' paper coil method [E. S. R., 20, 

 p. 512] and its modifications [E. S. R., 21, p. 412] are impracticable, being too 

 long and giving either too low results or an impure fat." The method which 

 is recommended is a modification of the Harding-Nye method (see abstract 

 above). "The principle of the method is the breaking down of the emulsion 

 by dissolving all protein in acetic acid, the solution of the fat in a mixture of 

 alcohol and carbon tetrachlorid, and its extraction with petroleum ether. The 

 reagents used are acetic acid, 25 per cent by volume, redistilled carbon tetra- 

 chlorid, 95 per cent ethyl alcohol, and petroleum ether with boiling point 

 between 50° and 70° C. 



" The apparatus used are a mortar and pestle for macerating the can's con- 

 tents, an evaporating dish of about 50 cc. capacity for weighing out the sample, 

 a 100 cc. flask for making up the 40 per cent emulsion, a 10 cc. graduated pipette, 

 a 100 cc. Nessler jar fitted with 2 rubber stoppers, 1 unperforated and used 

 while centrifuging, the other doubly perforated, bearing blow-off tubes similar 

 to the Werner-Schmidt blow-off tube, a centrifuge, a 7 cm. filter paper, funnel 

 and stand, wide-mouthed fiasks of 50 to 75 cc. capacity for weighing the fat, a 

 small evaporating dish for holding wash petroleum, a petroleum ether wash 

 bottle, a condenser, and drying oven." 



The results obtained by the method are compared with those given by the 

 Rose-Gottlieb, the Hortvet modification of the Rose-Gottlieb method for con- 

 densed milk, and the West " and modified Babcock method for ice cream. 



"Bien. Rpt. Minn. State Dairy and Food Comr., 12 (1907-8), p. 292. 

 16385°— No. 6—13 2 



