JOURNAL OF MICROSCOPICAL SCIENCE. 



EXPLANATION OF PLATES XVI, XVII, XVIII, 



Illustrating Dr. Foulis's paper on the Development of the 



Ova and Structure of the Ovary in Man and other 



Mammalia. 



In these plates the same letters have been employed to mark correspond- 

 ing structures in the whole series of figures. 

 h. Germ epithelial corpuscles. 

 h^. Corpuscles from the surface of adult ovary. 

 j. Connective tissue stroma of the ovary. 

 k. Blood-vessels. 



/. Large spherical germ epithelial corpuscles. 

 m. Primordial ova. 

 n. I'usiform corpuscles in contact with the yelk substance of the 



primordial ova. 

 0. Large egg clusters. 



p. Tubiform depressions of the surface of the ovary. 

 q. Small groups of germ epithelial corpuscles being included in the 



stroma of the ovary. 

 r. The membrana granulosa. 

 s. The zona pellucida. 



t. The yelk substance of the nearly mature ovum. 

 u. Individual corpuscles of the membrana granulosa, showing the 

 nucleus surrounded with a considerable quantity of protoplasm. 

 V. Division of the nuclei of the corpuscles of the membrana 

 granulosa. 

 All the figures were drawn by the aid of the camera lucida from actual 

 preparations. 



With the exception of figures 3, 5 and 24, R. and J. Beck's one-tenth 

 immersion lens, adapted to Hartnack's instrument with ocular No. 3, 

 was used. 



In figures 3 and 24 ocular No. 4 was employed. 



In figure 5 objective one sixth (Swift) with ocular No. 3. 



PLATE XVI. 



Pig. 1. — A portion of the ovary of a human foetus of three and a half 

 months, showing the germ epithelium (//) and groups of large germ epithelial 

 corpuscles or egg clusters (o) imbedded in the stroma. The stroma (_;') 

 consists almost entirely of connective tissue corpuscles. 



Fig. 2. — A portion of the same ovary, showing large primordial ova (w) 

 imbedded in the stroma {j). Pusiform corpuscles {n) of the stroma are 

 seen in contact with the yelk of these primordial ova. 



Pig. 3. — A portion of the ovary of a human foetus of seven and a half 

 months, showing the manner of inclusion of the germ epithelial corpuscles 

 in groups {q) in the stroma of the ovary. 



Pig. 4. — A portion of the ovary of a human foetus of seven and a half 

 months, showing in section the furrows (^) which lie between the promi- 

 nences on the surface of the ovary. 



Pig. 5. — A portion of the ovary of a child at birth, showing the stroma 

 {]) crowded with primordial ova {ni). 



PLATE XVII. 

 Pig. 6. — Section through the ovary of a human foetus of seven and a half 

 months, showing the germ epithelium (li), large spherical corpuscles (/), 

 and groups of similar corpuscles or egg clusters (o) imbedded in n)eshes of 

 the stroma (_;'). In the lower part of the figure many primordial ova {ni) in 

 various stages of development are seen. In contact with each primordial 



