ACRICrLTrKAI. ClIKMISIHV. 9 



n-Mter to iiiaUc n iiastc and then Lxraduall.v thinned willi lint wntci- and finally 

 made up to Kin cc. If tiic ])o\vdci- is not all dissolved a little ammonia may be 

 added, ("ane sugar is determined by the method descriiied by Harrison (E. S. 

 K.. 1C>. p. S4()). Proteids are calculated from the total nitroicen of the Kjeldahl 

 method I)y the factor ('>.S7. 



Two of the samples examined were api)arently made from skim milU. two bad 

 received an addition of saccharate of lime, one an addition of a phos])hate, two 

 an addition of cane su,i,'ar, and one an addition of sodium carbonate. Only one 

 sample was made without the addition of any substance desi.s,Mie<l to render the 

 dried milk more soluble. 



Determination of the proteids in milk, A. Trillat and E. Sauton {Ann. 

 Chilli. Anahjt.. 11 {1!>06), Xo. (>. />/>. 20 ')-2fJ7).— Five cc. of milk is diluted with 

 water to 25 cc., boiled for .1 minutes and treated with ."» drops of commercial 

 formalin. After again boiling for 2 to 3 minutes and allowing to stand for 5 

 minutes, ."i cc. of a 1 per cent solution of acetic acid is added. The line precipi- 

 tate is then collected on a weighed filter, washed with water, and the fat 

 extracted with acetone in a Soxhlet extraction apparatus. The fat-free mate- 

 rial is then dried at 75 to 80° ('. and weighed. The entire operation occupies 

 less than 2 hours. The fat may be determined by evaporating the acetone. 

 The method is api)licable to milk iireserved with potassium bichromate. 



Estimation of casein. A preliminary study, H. V. Arny and T. M. Pratt 

 (.inicr. .Jour. I'liann., 18 (,1!)06), Xo. 3. pp. 121-128). — lu the volumetric method 

 proposed a definite quantity (.5 to 30 cc.) of milk is treated at ordinary tem- 

 peratures with 20 cc. of decinormal ferric alum solution (48.1 gm. per liter), 

 the mixture diluted with water, allow^ed to stand for a few minutes, filtered, the 

 filter washed until free from iron, and the excess of ferric alum in the filtrate 

 determined l)y titration with potassium iodid, hydrochloric acid, and decinormal 

 sodium thiosulphate. The difference between the amount of ferric alum taken 

 and that found in the filtrate gives the quantity required for the precipitatiofi 

 of the casein. Concordant results were obtained in numerous determinations. 

 Ex[>eriments indicated that the reaction is not afi'ected by the fat and sugar in 

 the milk. Comparative determinations were made to establish a relationship 

 ■ between the quantity of ferric alum solution required to precipitate the casein 

 and the nitrogen in the precipitate as determined by the Kjeldahl method, but 

 further work is considered necessary in order to establish a definite standard. 



The determination of fat in cheese, :M. Weihull (Svensk Rem. Tidskr., 17 

 (1005). A'o. 6. pp. 7.'/(5-i//8).— The author recommends the Gottlieb method for 

 the determination of fat in cheese. The results obtained by this method were 

 somewhat higher than those obtained by the ordinary extraction method and 

 the Scbmidt-Kondzynski hydrochloric-acid method. — f. w. woll. 



Chemistry in the kitchen and household, G. Abel (Clirinic in Kiiche und 

 ffaiis. LcipKic: B. ('. Tnihner. I'.lOr,. pp. YI + 162. fxg-^. 6).— In this volume, 

 which is designed for popular use, some of the principles of chemistry are 

 discussed with special reference to the household. • The bulk of the volume 

 deals with the application of chemistry in the home, the special topics treated 

 being fire, lighting and heating, cooking utensils, etc., animal foods, vegetable 

 foods, and condiments. 



Chemical department, E. E. Eadd (\orth Dukotn sin. Ujii. P.inr,. pp. 

 l')-22). — In addition to meteorological observations noted elsewhere, this report 

 contains analyses of several proprietiiry stock foods, 3 sami)les of maimre. and 

 11 of Paris green. 



Report of the chemist. U. I". IIakk {\cir Mcriro Sla. h'pl. 100 1 pp. 

 ■V]-'iG). — This repoi't on the work of the cliemicnl (K^partmenl during the year 



