14 



THE FAT OF MILK. 



The above figures all show that the liquid fat is somewhat 

 richer in both volatile and unsaturated acids than the original 

 fat, while the solid portion is correspondingly poorer in these 

 constituents. There is, however, no sharp separation. 



The density of the fat of milk is as follows (Table IV.) : 



TABLE IV. 



The last figure is not a true density, as it is not corrected for 

 the expansion of glass between 15-5 and 100 ; it has been 

 assumed that the volume of the glass instrument used to deter- 

 mine the density is the same at 100 as at 15-5. The error has 

 no practical importance when the figures thus obtained from 

 different samples are compared, as they are all subject to the 

 same correction. 



From the average specific gravities given above the author 

 has calculated the true specific gravities and specific volumes 

 (Table V.) ; these are : 



TABLE V. 



