PLATE 3 



EXPLANATION OP FIGURES 



21 Medullary follicle, illustrating the investment by the follicle mass. A group 

 of stroma cells in the form of interstitial cells are being included (0- Photograph. 

 X 250. 



22 Irregular cumulus oophorus from a medullary follicle. The line of junction 

 is still indicated {j). A small group of included stroma cells is also shown (s). 

 Groups of interstitial cells lie external to the follicle (i). Photograph. X 250. 



23 The development of medullary follicles. The elongated form of some of 

 the follicle masses is illustrated. Four ova are related to the one shown, each with 

 its peculiar sheathing follicular epithelium, two of them being cut through the 

 nucleus. Photograph. X 60. 



24 Two developing medullary follicles. Note the stromal investment of each. 

 Groups of interstitial cells are shown interspersed. Photograph. X 100. 



: 25 Two developing medullary follicles. Nodules of stroma are included 

 between the investing and sheathing follicular epithelium. Photograph. X 100. 



26 Mitotic spindle (polar spindle?) in a degenerating ovum. Ovary no. 39. 

 Photograph. X 250. 



27 Polar body. Degenerating ovum. From a section adjacent to that of fig- 

 ure 26. Photograph. X 250. 



28 Ovum degenerating by fragmentation. A single nucleus is shown in tlie 

 larger fragment. Two nuclei appear in the fragment immediately to the left of 

 it. Photograph. X 250 (approx.). 



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