53 



To 25 cc of milk or cream add 10 cc of a 5 per cent solution of uranium acetate, 

 shake, allow to stand for five minutes and filter. If the filtrate is not clear pour it 

 through the filter au r ain. To 10 cc of the clear filtrate (in the case of cream use the 

 total tilt rate it le.-s than 10 cc) add 2 cc of a cold saturated solution of ammonium 

 molyl'date ami s cc of dilute hydrochloric acid (1 part of 25 per cent hydrochloric acid 

 and 7 parts of water > .-hake well and place in a water bath at 80 C. for five minutes. 

 If tin- .-ample is pure the solution will resemble a nickel sulphate solution, but if sugar 

 is pre.-ent it will l.o of a Prussian blue color. These different colors can be readily 

 distinguished but it is advisable to compare with a standard blue solution made by 

 adding a few dr-'p.- <>f p>ta.-.-ium ferrocyanid and 5 drops of 10 per cent hydrochloric 

 ae id to a solution of 1 cc of 0.1 per cent ferric chlorid in 20 cc of water. 



.\ I kul i n i in i if ash. Evaporate 25 cc of cream to dryness, and burn to an ash in a 

 inutile lM.-.-olv' the a.-h in an excess of tenth-normal sulphuric acid, boil to expel 

 the carhnii dioxid and titrate back with tenth-normal sodium hydroxid, using phe- 

 nolphthalein as the indicator. Express results as cubic centimeters of tenth-normal 

 aeid required to neutralize the ash of 100 grams of cream. 



Determination of nifdnm. Add acetic acid to the final solution from the above 

 determination, heat to l.<>ilin<_r. add 1 gram of sodium acetate and an excess of ammo- 

 nium oxalate. Filter and wash the piwipitated calcium oxalate with water, dissolve 

 in In>t dilute sulphuric acid, and titrate hot with tenth-normal potassium perman- 

 Ihe number of cubic centimeters of tenth-normal potassium permanganate 

 multiplied l.y o.ol 12 (4 X 0.0028) gives the percentage of calcium oxid in the sample. 



The table appended shows the composition and reactions of pure and adulterated 

 cream, usimMhe liaierand Neumann methcxl for calcium sucrate. It is recommended 



that this metliM.l l,e di-tributed for rritiei-m 



Results on pure and adulterated creams using th> />// / and Neumann -method for calcium 



sucrate. 



REPORT ON CEREAL PRODUCTS. 

 By E. F. LADD, Associate Referee. 



During the past year considerable work was undertaken in our own laboratory upon 



1 products, very little of which has as yet been completed. Therefore only a 



report <>f progress can be made. As the result of examinations made by A. S. Mitchell, 



< -hi.-f ..f the Si Paul Finn! and Drug Inspection Laboratory, the following methods are 



suggest ed: 



METHODS FOR ANALYSIS OF CEREAL PRODUCTS. 



MOISTURE. 



I >ry a convenient quantity of the flour (approximately 5 grams) at the temperature 

 of 1,.,'ilin.r \\at.-r iii a current'..! dry hydrogen or in vacuo until it ceases to lose weight. 



