190 ' DR. JAMES FOULIS. 



group of six cells and nuclei taken from another part of the 

 preparation having been inserted instead. Of the four nuclei 

 in this group, three are elongated and appear to belong to 

 the vessels ; the most internal one, on the contrary, is round, 

 and resembles those contained in the cells. Some clue to the 

 existence of these free rounded nuclei may perhaps be afforded 

 by the appearance seen at another part of the plate. In the 

 right upper corner is a cell of which the protoplasm is so 

 pale as scarcely to be visible, while nearer the middle of the 

 lithograph is a nucleus nearly extruded from its cell. In the 

 lower part of the plate are to be seen three or four unequi- 

 vocal instances of union of fibres derived from Purkinje's 

 cells with the protoplasm of small cells in the outermost 

 layer of the adult cerebellar cortex. Such connections are, 

 of course, faithfully copied from the preparation. 



On the Development of the Ova and Structure of the 

 OvAEY m Man and other Mammalia. By James Foulis, 

 M.D, Ed. (With Plates XVI, XVII, XVIII.) 



Contents. — Introduction. The Ovary of the Kitten. The Human 

 Ovary : (a) Nature of the germ epithelium ; (b) The relation of the germ 

 epithelium to the peritoneal epithelium; (c) The manner of inclusion of 

 the primordial ova and germ epithelial corpuscles in the stroma of the 

 ovary ; (cl) Development of the egg clusters ; (e) The development of the 

 membrana granulosa. General observations on the development of the 

 membrana granulosa in adult ovaries. General conclusions. 



In the month of August, 1872, Professor Turner suggested 

 as a subject of investigation, the structure of the ovary and 

 the development of the ova, more especially with reference 

 to the recently published observations of Waldeyer. On the 

 21st December, 1874, Professsor Turner read before the 

 Royal Society of Edinburgh a paper setting forth the result 

 of my observations ;^ but in the month of April of the same 

 year, in ray graduation thesis for the degree of M.D.," I had 

 already demonstrated that the eggs and follicular epithelial 

 cells have a different origin. 



In the year 1870, W. Waldeyer published his observations 

 on the development of the ovary and ova.^ In this beautiful 



' " On the Development of the Ova and Structure of the Ovary in Man 

 and other Mammalia," ' Transactions of the Royal Society of Edinburgh,' 

 vol. xxvii, 1875. 



- ' Contributions to the Normal and Pathological Anatomy of the Ovary 

 and Parovarium,' April, 1874. 



2 ' Eierstock und Ei,' Leipzig, 1870. 



