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80
Fifty-seven of the Grade "A" milks and the "Certified" milk were
submitted by the Inspectors. Twenty-two Grade "A" milks were
submitted by the Bottlers.
Four of the Inspectors' samples were taken on delivery at the Railway
Station and 2 of them on delivery at the Bottlers' premises.
Seventeen of the 79Grade "A" samples failed to reach the required
standards of bacterial purity. Two of these were samples taken at
Railway Stations.
In 8 cases both Bacillus coli and the total organisms exceeded the
numbers allowed. In 9 cases Bacillus coli only was in excess.
Bacillus coli was present in 9 cases in 1/1000 Cc, in 1 case in 1/200
Cc. and in 7 cases in 1/100 Cc.
The total numbers of organisms present varied from 500 per 1 Cc
to 3,000,000 per 1 Cc..
In general the numbers were well below 100,000 per 1 Cc and in 45
cases the numbers were below 10,000.
It is only fair to state that most of the unsatisfactory samples were
taken in the spell of hot weather during the late summer.
From an examination of the figures obtained there does not appear
to be any ratio between the presence of Bacillus coli, the typical intestinal
organism, and the total numbers of organisms. In one case with a total
of 5,000 organisms per 1 Cc, Bacillus coli was found in 1/1000 Cc. At
the other extreme, with a total of 200,000 organisms per 1 Cc, Bacillus
coli was present in 1/100 Cc only. The first case evidently indicated
dirt contamination on the premises of the Producer.
In chemical composition these milks were as follows:-
Fat varied from 2.7 to 7.9 per cent., with an average of 3.90 per cent.
Total solids varied from 11.2 to 16.0 per cent. with an average of
12.46 per cent.