Mix the milk thoroughly by pouring into another vessel and 
measure out the amount of the daily supply requisite as indicated 
by the age and weight of the child; e. g. : Weight of child 1 month 
old, 4 kilograms (9 lbs.) ; A of body weight=:570 grams (19 ounces) ; 
daily quantity of milk=570 grams (19 ounces). Divide the 
quantity of milk so obtained in nursing bottles each containing equal 
parts according to the daily number of feedings advocated in another 
part of this paper (see breast feeding). Sterilize it by standing the 
bottles, each corked with absorbent cotton, in boiling water up to 
their necks and boil for a period of three- fourths to one hour. Cool 
and preserve the bottles on ice until required. Before feeding heat 
the milk to blood temperature by standing the bottle in hot water. 
Sterilization of the milk is advocated in the case of all infants under 
3 months of age for reasons presently to be discussed. After that 
time it may be discontinued, and pasteurization of the milk substi- 
tuted imtil the eighth or ninth month, when raw milk may be used, 
provided the weather be cool, the milk reliable, and the use of the raw 
milk produces no digestive disturbance. During the summer it is 
better to pasteurize or to sterilize all milk used in infant feeding. All 
pasteurization and sterilization are, however, processes to be reserved 
for home use only. As a rule milk that has been commercially pas- 
teurized or sterilized should not be used, as it may have been imper- 
fectly kept by the dealer after the process. 
Reasons for the - sterilization and pasteurization of milk . — Apart 
from the safety the sterilization or the pasteurization of milk con- 
fers by virtue of the destruction of all its nonspore bearing bacteria 
(the word ct sterilization ” is not used here in the laboratory sense, 
but refers merely to measures which will destroy ordinary patho- 
genic organisms) there is abundant and incontrovertible evidence 
to show that by these measures both the morbidity and the mor- 
tality of infants from gastro-intestinal disease has been greatly 
reduced. 
There are also additional and important reasons in the case of 
infants of less than three months of age which render the steriliza- 
tion of the milk for their use especially desirable. Bussell has 
shown that heating the milk destroys the tendency of the fat globules 
to coalesce and distributes them uniformly throughout the milk. 
This combined with the partial inhibition of the curding action of 
the gastric juices upon the casein of heated milk prevents the for- 
mation of large fat containing curds in the stomach. 
Xow, the gastric capacity of young infants is both absolutely and 
relatively very small. During the act of nursing, when the stomach 
has been filled a portion of its contents is passed on into the duode- 
num. That this must take place is readily shown by consulting the 
