If not all the milk is used and the bottle must be
returned to the cool place where it is kept, it should be covered by
means of an inverted drinking glass or, as shown in Fig. 6, by a glass
or porcelain cover. Such covers, or _sanitary milk_ _caps_, as they are
called, are very convenient for this purpose and may be purchased at a
slight cost.
52. Another precaution that should be taken is never to mix stale milk
with fresh milk, because the entire quantity will become sour in the
same length of time as the stale milk would. Also, milk that has been
poured into a pitcher or any other open vessel and allowed to stand
exposed to the air for some time should never be put back into the
bottle with the remaining milk. Such milk is sure to be contaminated
with the germs that are always present in the dust constantly
circulating in the air. It is sometimes necessary to keep milk in a
vessel other than the bottle in which it is delivered. In such an event,
the vessel that is used should be washed thoroughly, boiled in clean
water, and cooled before the milk is poured into it.
[Illustration: Fig. 6]
53. Particular care should be taken of the empty milk bottles. They
should never be used for anything except milk. Before they are returned
to the dairyman to be used again, they should first be rinsed with cold
water, then washed thoroughly with hot, soapy water, and finally rinsed
with hot water. If there is illness in the home, the washed bottles
should be put into a pan of cool water, allowed to come to a boil, and
permitted to boil for a few minutes.
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