io MILK [n 



From the above it will be seen that a considerable 

 variation in the composition of the milk of different 

 animals exists, the milk of the porpoise being the 

 richest in solids, while that of the elephant comes 

 next ; whereas that of the mule contains the largest 

 percentage of water. The most wide variation, it 

 will be seen, is in the fat, the other constituents 

 being present in comparatively uniform amounts. 



As we have said, considerable variation in the 

 composition of the milk of the same species of 

 animal may exist, and this is the case with regard to 

 cows' milk, with the composition of which we are 

 most familiar. 



At first sight, therefore, it would seem rather 

 difficult to say exactly what amount of these different 

 constituents constitutes normal cows' milk. 



The following tables, drawn up by different 

 authorities, illustrate this variation, and give, at the 

 same time, what is considered by their respective 

 authors to be the composition of average milk : 



