ON MILK AND MILK-TESTING 



21 



proportions in which the milk and the cream or 

 skimmed milk should be mixed. 



The idea can, perhaps, be more easily understood 

 by working out a problem such as the following: 



How much 5 per cent milk must be added to 3.5 

 per. cent milk to make 1,000 pounds of 4 per cent 

 milk? 



.5 jI X 1000 lbs.=333 lbs. 



1.0 

 l.S 



1.0 



1^ X 1000 lbs.= 666 lbs. 



The milk must be mixed .5 part of 5 per cent 

 milk and i. part of 3.5 per cent milk in every 1.5 

 parts. Therefore, as figured above we must mix 

 333 pounds of 5 per cent milk and 667 pounds of 

 3.5 per cent milk in order to make 1,000 pounds of 

 4 per cent milk. 



Prof. Oscar Erf has also prepared a table to be 

 used in standardizing milk and cream, but it is not 

 necessary to give it here. 



V/hat means are commonly used to improve the 

 milk supply of towns and cities? 



This work usually is conducted under direction 

 of the boards of health. In most places all per- 

 sons delivering milk in towns and cities must com- 

 ply with the requirements of a special law which 

 states that all milk sold must be produced and 

 handled in such a manner that it reaches the con- 

 sumer in a clean, sanitary condition. 



Inspectors are appointed to inspect the dairies 

 and, if necessary, compel the farmer to improve his 



