July 15, 1925 
Gleaning Milking Machines 
195 
There was practically no difference in the results obtained by the 
chloride of lime method and the salt and chloride of lime during the 
colder weather. About 92 per cent of the samples of milk drawn 
with the unit sterilized in the chloride of lime solution had bacterial 
counts of 10,000 per c. c. or lower. About 90 per cent of the samples 
of milk drawn with the unit sterilized in the salt and chloride of lime 
solution had bacterial counts of 10,000 per c. c. or lower. 
Neither of these two methods gave as good results in warm 
weather as they did in cold weather; and the salt and chloride of lime 
method gave much better results than did the plain chloride of lime. 
Only about 57 per cent of the samples of milk drawn with the unit 
sterilized in the chloride of lime solution had a bacterial count of 
10,000 per c. c. or lower, and about 75 per cent of the samples drawn 
with the unit sterilized with the salt and chloride of lime solution had 
a count of 10,000 per c. c. or lower. The salt and chloride of hme 
solution corroded some of the metal parts. 
The results obtained in these experiments were chiefly concerned 
with once-a-day milking; check samples taken from twice-a-day 
milking, however, showed practically no difference, there being a 
variation of less than 100 bacteria per c. c. in the averages of once- 
a-day and twice-a-day milking for each method. During this 
E eriod when samples were taken twice a day the unit sterilized with 
eat was allowed to remain in the hot water until the next milking, 
the water cooling gradually. The other two units were treated as 
formerly, being placed in their respective sterilizing solutions after 
they were washed, and allowed to remain there until the next milking. 
Bacterial counts made on samples of the sterilizing solutions taken 
from the long milk tubes of the two units sterilized in the chloride 
of lime and the salt and chloride of lime solutions, varied considerably. 
In cold weather, there was no correlation between the age or 
bacterial counts of the solutions and the bacterial counts of the milk 
samples taken on the same days. During the warm weather, how¬ 
ever, there was a direct relation (with one exception) between the 
age of the solution and the bacterial count of the milk; the older the 
solution, the higher the bacterial count of the milk. 
The experiments indicated that making up a fresh sterilizing solu¬ 
tion of chloride of lime, or of salt and chloride of lime, once a week 
in cold weather, would undoubtedly be sufficient to insure a good 
f rade of milk, if the units were thoroughly washed and the solution 
ept free from all foreign matter. During warm weather, however, 
fresh chloride of lime solution should be made daily, even under the 
most cleanly conditions; and new salt and chloride of lime solutions 
should be made up about every other day. 
