Abstract
The present paper consists of a series of records of the growth of the oocyte and follicle in the ovary of the adult mouse. Wherever it has been possible, these records have been put in mathematical form. The results show clearly, amongst other things, that the major part of the growth of the Graafian follicle takes place after the contained oocyte has attained its maximum size. This fact is of considerable interest in connection with the evolution of the mammalian follicle and its physiological rôle. The author would like to take this oppurtunity of expressing his thanks to "Student" for advice and criticism of the statistical treatment of the results, and to Prof. J. P. Hill, F. R. S., and Dr. A. S. Parkes for the interest they have taken in the work.

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