THE CHEMISTRY OF THE MAMMARY GLAND

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Abstract
I. Analyses of mammary gland tissue from lactating bitches and cats show that considerable differences exist between different parts of the same gland, between glands of the same animal, and between glands of different animals of the same species.II Lactose is only found when the gland contains milk. It is not found in the gland of a pregnant animal. Most of it can be removed by draining the gland, so that the amount present is a measure of the milk content of the gland.III. Since lactose is not a constituent of the parenchyma cells, it must be formed from some other substance in the process of secretion into the alveoli.IV. The fat obtained from the gland cannot be taken as an indication of the amount of milk constituents it contains, because fat is found not only in the parenchyma cells in the milk within the alveoli, but also as adipose tissue between the alveoli.The subject of this research was suggested by Dr Cramer, to whom I have been indebted for advice.The expenses have been defrayed out of the Earl of Moray Fund, University of Edinburgh.

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