PLATE 1 



EXPLANATION OF FIGURES 



1 Example of a graft growing on the chorio-allantoic membrane, showing 

 also the vascular connections. Ovary graft; embryo no. 17-5. Gr, graft; bv, 

 blood-vessel. X 3. 



2 Section of the same graft. Fo, follicles. Oc. 2 X obj. 1/12. 



3 Section of normal adult ovary. Fo, follicles. Oc. 2 X obj. 1/12. 



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