ii2 MILK AND DAIRY PRODUCTS PART 



amount of fat in the total solids, the reduction being more or 

 less according to circumstances. If the specific gravity has 

 been found to be normal, but the fat, on the other hand, too 

 low, then there is cause for suspecting the removal of cream. 

 After the amount of total solids, which under the conditions in 

 question is very low, has been ascertained from Table VII, 

 a and &, the percentage quantity of fat in the total solids is 

 calculated from the formula: p= 100 f/t. 



If the percentage amount of fat in the total solids is less 

 than 19'9 (see p. 100), it is practically certain that the milk has 

 been adulterated either by removal of cream or by addition of 

 separated milk. The weight of solids not fat under such 

 circumstances is often greater than with unadulterated milk. 



III. SIMULTANEOUS REMOVAL OF CEEAM AND ADDITION OF 

 WATER OR SEPARATED MILK. 



This kind of adulteration is generally easier to detect than 

 the simple removal of cream, although the specific gravity alone 

 does not afford any certain indication provided the falsification 

 has been cleverly done. The specific gravity may then remain 

 normal, and a determination of the fat, the total solids, and the 

 percentage amount of fat in the latter are necessary to prove 

 the adulteration. In such cases the quantit} 7 of fat and of total 

 solids is abnormally low, and the percentage amount of fat in 

 the total solids is also lower than under normal circumstances. 



The Stall Test. 



Recourse is had to this method of testing a milk when the 

 analytical results point to adulteration having been practised 

 in one or other of the above-mentioned ways. In order that 

 such a test may be of value, it is not only necessary to know 

 from which herd of cattle the milk has come, but also whether 

 the milk was morning's, evening's, or mixed from all the cows 

 in the herd or only from a few of them, &c. When these 

 particulars have been obtained, then a sample of milk should 

 be taken in such a manner as to obtain exactly the conditions 

 under which the suspected one was procured. If, for example, 

 the suspected example was taken from milk drawn at 5 o'clock 

 on the evening before, then the test sample should be procured 



