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98
From these results it will be seen that three of the
laboratories detected the addition of the raw milk, and
that, apart from a slight variation in the figures of the
stated number of blue units, the results were comparable.
Laboratory "D" is one which carries out the analysis
of milk samples for the "trade" at a very low charge,
and it would appear that those responsible for the examination
of the samples in question had little or no knowledge
of the test or that the technique employed in carrying out
the examination was unsatisfactory.
A number of samples have also been submitted to both
the phosphatase test and bacteriological examination, and
it is interesting to note that in many cases where the
phosphatase test has been positive, i.e., the milk had not
been properly pasteurised, the plate count has been
reported to be well within the maximum limit prescribed
by the Milk (Special Designations) Order and would have
been passed as satisfactory had it not been for the new
test. In no instance has a sample, reported negative to
the phosphatase test, given a bacterial count in excess of
the standard.
The results so far obtained point to the test being of
great value, and it has been adopted as a routine measure
in the control of pasteurisation in Hammersmith.
The following table (B) sets out the results of samples
taken during the year:—