52 



MILK SUPPLY 



tion obviously shows its unfitness, the cause of which should be 

 promptly investigated and removed. 

 Fig. 9. 



The Sediment Test. This 

 test shows the relative amount of 

 dirt present in milk. One-half 

 pint is passed through a small cir- 

 cle of absorbent cotton and the 

 amount of mechanical impurities 

 present in the milk is indicated by 

 the color of the cotton after filtra- 

 tion. In order to hasten the filtra- 

 tion, the milk is forced through 

 the filter under slight pressure; 

 this is accomplished by a rubber 

 bulb attachment to the apparatus, 

 as shown in the accompanying 



9 Pi*. 9 



' ' The sediment tester 



Pig-. 10. Cotton Filters 



Clean milk 



Dirty milk 



If the cotton retains a white or creamy color, the milk is 

 relatively free from filth. Milk .produced under unsanitary con- 

 ditions stains the cotton brown or black. 



These cotton filters may be pasted on a sheet of paper similar 

 to a milk sheet, arranged so that the circles are placed opposite 

 the respective patron's name or number. When shown to the 

 patrons who come to the factory, they furnish a most effective 

 object lesson to them. When the milk reaches the factory on 



