52 Mik SUPPLY 
tion obviously shows its unfitness, the cause of which should be 
promptly investigated and removed. 
Fig Os 
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 abserbent 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 
Fig. 9. ieee 
5 The sediment tester 
Fig. 10. Cotton Filters 
Clean milk Dirty milk 
If the cotton retains a white or crearny color, the milk is 
relatively free from filth. Milk produced under unsanitary con- 
ditions stains the eotton 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 
