50 MILK-ANALYSIS. 



fed milk instead of for country-fed milk, as in the table, 

 is simple, viz., substitute 10 a for -\^- a ; substitute 0.4 a 

 for f ;f a. 



The occurrence of minus-quantities in the column headed 

 " Fat Removed " requires a word of explanation. These 

 minus-quantities have a real and substantial meaning. They 

 are the quantities of fat which have been the reverse of 

 removed, that is to say, which have been added to the 

 milk. Whenever one of these minus-quantities occurs in 

 the " Fat Removed " column, one of three things has hap- 

 pened : Either the minus'quantity is within the limits of 

 experimental error, as is the case with three of them (viz., 

 -0.06, -6.05, and -0.07), or the milk was town milk, or the 

 milk had through imperfect mixing received an undue share 

 of the cream. There are only four cases of the kind in the 

 table, viz., -0.57, -0.28, -0.47, and -0.34. 



