A Comparative Morphological Study of the Mammary Glands with Reference to the Known Factors Influencing the Development of Mammary Carcinoma in Mice^*

The histological portions of this paper are included in a thesis as partial fulfillment of the requirements for the Ph.D. degree in Cancer Biology by the senior author. The research was aided by grants from the Cancer Research Fund of the Graduate School of the University of Minnesota, and the Jane Coffin Childs Memorial Fund for Medical Research.