THE ANALYSIS OF MILK 13 



small ash-free filter ; wash with hot water. Place the 

 filter and its contents in the basin, and ignite ; the 



FIG. 10. Muffle. 



residue is the insoluble ash and the soluble ash can be 

 obtained by difference. 



Estimation of Alkalinity, Chlorine, Lime, and 

 Phosphoric Acid. To the filtrate containing the 

 soluble ash add a drop or two of phenolphthalein 



solution, and titrate with sulphuric acid (see 



