198 MARKET DAIRYING 
With a reasonable amount of care in milking, the 
amount of dirt now carried in market milk could easily 
be reduced 75 per cent. 
Producers as a rule do not realize how much dirt 
actually gets into their milk because they are not able 
to see it in the cans except when the cans are care- 
fully emptied, in which case dirt may be noticed in 
the bottom of the can. Sediment is also noticeable in 
dirty bottled milk. 
The best way of demonstrating to producers the con- 
dition of their milk with respect to dirt, is to use sedi- 
Fig. 51.—Cotton Filters. 
ment testers like those shown in Figs. 50 and 52. These 
are simple devices for filtering the dirt out of milk. The 
tester shown in Fig. 50 is a small metal container into 
which the milk is poured, the cover clamped on and 
the milk forced through a cotton filter by squeezing 
the air bulb. The device shown in Fig. 52 does away 
with the metal container, the cover with attached air 
bulb being clamped on the milk bottle and the milk 
forced directly from the bottle through the cotton filter. 
Any dirt removed from milk with either of these testers 
is easily seen on the white cotton filters. (See Fig. 51.) 
