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Histology ofthe lactating breast.-It is common knowledge that physiological function depends on the capacity of an organ to respond to an adequate stimulus. In the case of the breast there is variability in the function of lactation; this may be due either to inadequate capacity of the breast or of lactogenic stimuli. A morphological study of a large number of breasts revealed that the breast does, in fact, show great individual variations in structure which are closely related to its functional capacity.The methods of investigation were as follows: Sections through the whole breast were prepared, and these gave a good survey of mammary architecture. These sections were about 100lz thick. Thin sections cut from smaller blocks have been used for the investigation of