PLATE 5 



EXPLANATION OF FIGURES 



15 Embryo no. 47-10, modified by testis graft. X 3. 



16 Embryo no. 43-3, modified by testis graft. X 4. 



17 Embryo no. 27-5, modified by testis graft. X 3. 

 IS Embryo no, 15-5, modified by testis graft. X 3. 



50 



