PLATE 7 



EXPLAXATIOX OF FIGURES 



21 Embryo no. 8-5, modified by testis graft. X 3. 



22 Embryo no. 22-13, modified by testis graft. X 4. 



23 Embryo no. 17-7, modified by testis graft. X 4. 



24 Diagram of the urinogenital system of the same embryo. 



54 



