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74
MILK.
5. The particulars relating to the six samples of Milk reported as
adulterated are given in Table II.:—

6. The remaining 155 samples submitted were found to have the
normal composition of unadulterated milks, or of milks which must
be regarded as unadulterated, and to be in accordance with the requirements
of the " Sale of Milk Regulations, 1901," 56 " Formal " and four
" Informal" being of " Good" quality, 69 " Formal " and four
" Informal " of " Fair " quality, and 21 " Formal " and 1 " Informal "
of " Poor " quality.
7. The application of the terms " Good," " Fair," and " Poor " to
samples of Milk is based on the following analytical data : —
Non-fatty solids 8.5 per cent, or over:—
With from 3.0 to 3.35 per cent, of fat, Poor Quality.
„ 3.35 to 3.8 Fair
3.8 and over Good
TINNED FRUIT.
8. The informal sample reported as adulterated was found to be
contaminated with tin as understated :—
1. 0.0251 per cent., equivalent to 1.897 grains per lb
Two of the remaining samples contained slight traces of tin, insufficient
for determination.
9. The presence of Salts of Tin in canned Foods is due to the solvent
action of the natural acid of the fruit or vegetable upon the tinned surface
of the containing vessel. These Salts are not added directly to the food
material as is the case with Copper Salts, when the latter are used for the
purpose of imparting a bright green colour to peas and other vegetables.
Salts of Tin have an irritant action on the gastro-intestinal tract and their
presence in a food would therefore tend to render such food injurious to
health.