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118
the milk is removed into an adjoining room, strained through a
metal screen, cooled over a Lawrence refrigerator, and at once
separated by an ordinary Laval separator, which acts in part as a
method of purifying milk. The separated milk is then at once
modified as described below, and poured by means of a mechanical
automatic bottle-filler into bottles. The milk in bottles is then,
within a few minutes of leaving the udder, placed in the steriliser
and maintained at 140 °F. for twenty minutes. The bottles have
been previously sterilised at 220 °F. for sixty minutes. After
pasteurisation the milk is cooled to 53 °F., and kept at that
temperature until ready for packing into wooden travelling cases
(holding one hundred bottles each), for transmission to the
Distributing Dep6t at 264, Goswell Road, Finsbury. It may be
added here that it is not intended to continue sterilisation or
pasteurisation of the milk if it is found in practice that no
heating at all is required. The ideal is to provide a pure modified
unsterilised milk, and we are now conducting investigations with
a view of determining if any sterilisation at all is necessary.
Modification of the Milk.—The Medical Committee, with the
assistance of Mr. J. Kear Colwell, F.I.C., Public Analyst, carefully
considered the subject of standards of modification, and finally
decided to commence with the three following degrees :—
A.—One part milk, two parts water + 8 ozs. cream + 7 ozs.
milk sugar to the gallon.
B.—One part milk, one part water +11 ozs. cream + 5 ozs.
milk sugar to the gallon.
C.—Two parts milk, one part water +12 ozs. cream + 5 ozs.
milk sugar to the gallon.
Various degrees of modification were made with the average
milk supplied by Mr. Carson's herd, and the above were found
on analysis to yield desirable milks, and approximately comparable
to human milk:—