69 



Cellulose : A method for the accurate determination of cellu- 

 lose is not known. For practical purposes, it is generally sufficient 

 to estimate it as being present to the extent of 0.5 per cent. 



Determination of the Albuminates. 



It has been customary to calculate the albumen and albumi- 

 noids in milk-foods by determining tlie nitrogen. The figure ob- 

 tained for nitrogen was then multiplied by 0.25, it having been 

 accepted that the nitrogenous part contained 16 per cent, of nitro- 

 gen. This presumption is false. The nitrogenous substances go- 

 ing into the composition of milk-food contain from 15.5 to 18.5 

 per cent, of nitrogen. From this it is evident that results reached 

 by the determination of the nitrogen cannot be accurate, and it is, 

 therefore, useless to speculate as to the method, whicli in this case 

 is to be preferred, Dumas' or Will-Varrentrapp's. For all the other 

 constituents sufficiently accurate methods exist. Albumen is, 

 therefore, here as in the case of condensed milk, determined by 

 difference. 



Reports on Milk-foods. 



must contain : 



General description : Gross and net weight of packages, their 

 suitability, and, if possible, the price. 



Description of trade marie : Kemarks on fancy claims upon 

 the labels, as would be, for instance, the claim of a complete sub- 

 stitute for breast milk, etc. 



Physical description: Appearance, odor, taste, microscop- 

 ical examination. 



The chemical analysis should state: 



Water and volatile substances. 



Salts (phosphoric acid). 



Fat. 



Albuminates. 



Soluble carbohydrates. 



Insoluble carbohydrates. 



Cellulose. 



Statement giving the analytical method by which these results 

 were obtained. 



