In order that milk may remain sweet long enough to
permit it to be delivered at places so far removed from the source of
supply, it must be handled and cared for in the cleanest possible way by
the dealers. Likewise, if the housewife desires to get the best results
from it, she must follow the same plan, cooling it immediately on
delivery and keeping it cool until it is consumed. The freshness of milk
can be determined only by the length of time it will remain sweet when
proper care is given to it.
26. CLEANLINESS OF MILK.--Milk may be of the right composition, free
from all adulteration, and as fresh as it is possible to obtain it, but
unless it is clean, it is an injurious food. Milk is rendered unclean or
impure by dirt. In reality, there are two kinds of dirt that may be
present in milk, and it is important to know just what these are and
what effect they have on milk.
27. The less harmful of the two kinds of dirt is the visible dirt that
gets into the milk from the cow, the stable, the milker, the milking
utensils, and similar sources when these are not scrupulously clean. If
milk containing such dirt is allowed to stand long enough in pans or
bottles for the heavier particles to settle, it will be found as
sediment in the bottom of the receptacle. To say the least, the presence
of such dirt is always disagreeable and frequently produces
foreign flavors.
Straining the milk through clean absorbent cotton will reveal the
presence of such dirt and another kind of dirt that does not show
through the opaque fluid.
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