
ASEPTIC MILK. 53. 
precautions to exclude dirt or bacteria; the next day the milk 
was drawn under the following aseptic conditions: The cow's 
tail was tied to the leg on the farther side, and the flank, the 
side, and the udder were washed with a 3 per cent. solution of 
boracic acid and wiped with a sterilized cloth; the milker then 
washed his hands with the boracic acid solution and wiped them 
ona sterilized cloth. About half of the milk was milked out, 
and the udder and surrounding parts were again washed with 
boracic acid and wiped with a sterilized cloth. Once more the 
milker washed his hands and then drew the remaining milk into 
a sterilized, covered pail through four thicknesses of sterilized 
cheese cloth and a layer of absorbent cotton. ‘This milk we 
call aseptic milk. 
From the milk obtained in each of these ways, two samples 
were taken, one of which was kept at 70°, and the other at 50°. 
Plates were made from all four samples of milk immediately 
and also at the end of 12, 24, and 36 hours. ‘The percentage 
of acidity was determined at the same time that the plates were 
made. ‘The results are given in the following four tables. It 
will be noticed that at certain of the tests no results were ob- 
tained, due in some cases to the presence of liquefiers which 
destroyed the plates, and in other cases to the unexpectedly 
small number of bacteria, which led to too high dilutions of 
the plates. 
