SEPARATION OF CREAM. 141 
Machines are now made, and are on the market, which will 
bring the milk, or the fat-globules in the milk, into such a 
condition that they cannot be separated from the milk. The 
process is called “homogenization.” It consists of bringing 
the milk under certain pressure, and then forcing it out through 
a special valve. This relief, through this special valve, causes 
the fat-globules to divide up into very minute ones. They 
divide up to such an extent that they cannot be separated 
from the milk by gravity methods, and it is impossible to get 
a complete separation by centrifugal methods. Homogeniza- 
tion of milk is carried on to some extent in Europe. The 
process practically insures uniform quality to the milk patrons 
in the distribution of milk in cities, and secures a more uniform 
consistency of the product. 
2. Condition of the Milk.—In order to get complete separation, 
and keep the separator in good running order, it is essential 
that the milk should be in as good physical condition as possible. 
Coagulated, slimy, or otherwise viscous milk separates with 
difficulty. When such milk is on hand it should not be mixed 
with the milk that is in good condition, as it might tend to coag- 
ulate more of the good milk, and the coagulated or slimy lumps 
are likely to clog the separator. Such milk should be left 
until all the good milk has been separated. Then, if the coagu- 
lated or slimy milk is thoroughly stirred so as to reduce the 
lumpiness of it, it may be run through the separator success- 
fully. It is a good plan not to feed the separator quite so 
heavily when this quality of milk is being run through. By 
shutting off the inlet a little, it will usually run through without 
clogging. Milk containing impurities in suspension should be 
thoroughly strained previous to separation. 
Overfeeding the Separator—When a separator is being 
overfed with milk there is a tendency for the machine to do 
less complete work. This is due to the fact that the more 
milk is being fed into the separator the less time it will be 
exposed to the centrifugal force. It is impossible to underfeed 
the separator as well. As has been mentioned before, the 
