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10. Corpus luteum, fifth period. Mallory's stain. X 650. 



(a) Lutein cell showing no peripheral vacuoles. (A) Additional cell, type I . 

 I I. Corpus luteum, fifth period, osmic acid stain. X 650. 



(a) "Additional" cell containing large fat-globules. 



(A) Connective tissue cell containing minute fat-granules. 



12. Corpus luteum, sixth period, Mallory's stain. X 650. 



13. Corpus luteum, sixth period, osmic acid stain. X 650. 



14. Corpus luteum, seventh period, Mallory's stain. X 650. 



15. Corpus luteum, seventh period, osmic acid stain. X 650. 



16. Wall of unripe Graafian follicle, hematoxylin and eosin. X 400. 



(a) Granulosa. (A) Theca interna, (c) Theca externa. 



