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Kolliker, ' Entwickelungs-geschichte des Menschen und der Hoheren Thiere.' 

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 1866. 



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E. Wagner, ' Beitrage zur Geschichte der Zeugung und Entwickelung,' p. 42. 

 Wharton Jones, ' London and Edinburgh Phil. Mag.,' No. 39, Sept. 1835, p. 209. 



DESCRIPTION OF PLATE 1. 



Fig. 1. — Ovary of 20th day embryo (rabbit). Fixed in Gilson's fluid : — 

 a = protobroque cells. 

 b = „ (in mitosis), 



c = deutobroque cell. 

 d = connective tissue cell. 

 e = position of mesoblastic core. 



Fig. 2. — Cells in ovaries of rabbits just before and after birth. Fixed in Gilson's 

 fluid :— 



a = protobroque cell. 



6 1 

 c I 



^ )- = transition forms between (a) and (/). 



/ = deutobroque cell. 



Fig. 3. — Ovary of three days old rabbit showing formation of egg-clusters. Fixed in 

 sublimate solution : — 



a = protobroque cell. 



b = deutobroque cell. 



c = „ in mitosis. 



d = leptotenic stage in ovogenesis. 



Fig. 4. — Cells in ovaries of young rabbits. Fixed in Gilson's fluid : — 

 a = deutobroque cell in ovary of three days old rabbit. 

 b = „ „ about 18 days old rabbit. 



c r 



> = transition stages from deutobroque to ovarian cell in ovary of about 

 18 days old rabbit. 



d 



e 



f 

 9) 



h = interstitial cell 

 k = follicle cell 



j'from ovary of young rabbit (18 days). 



