$8 MILK ANALYSIS 



ducted at such a rate that the above amount of distillate is 

 collected in 30 minutes. 



The distillate is usually clear; if not, it should be thoroughly 

 mixed, filtered through a dry filter, and 100 c.c. of the filtrate 

 taken. A little of the indicator is added to the distillate, and 

 the standard alkali run in from a buret until neutralization is 

 attained. If only 100 c.c. of the distillate have been used for 

 the titration, the number of cubic centimeters of alkali should 

 be increased bv one-tenth. 



FIG. 8. 



The distilling apparatus shown in figure 8 is that recom- 

 mended by the A. O. A. C. (and since adopted in Great Britain), 

 and the directions for preparing the flask are also from the 

 same source, but when it is intended merely to distinguish 

 butter from oleomargarin, it will be sufficient to saponify 3 c.c. 

 of the clarified fat, dilute, acidify, distil 100 c.c. in the ordinary 

 manner and titrate as directed. ''Straight oleos," that is, 

 samples containing inappreciable amounts of butter, will give 

 a distillate requiring only a few c.c. of alkali. 



