172 OVARY AND PAROVARIUM, BY W. WALDEYER. 



former point when discussing the development of the ovary. 

 In regard to certain Mammals that are frequently used for 

 microscopic examination, it may be remarked that in the case 

 of the Cat and of the Kabbit a layer of extremely small follicles 

 are arranged in grape-like groups immediately beneath the so- 

 called tunica albuginea, forming the cortical-cell zone of Schron 

 (102), or the cortical zone of His (52). Schron erroneously 

 regarded these very young follicles as ova. Follicles clustered 

 in a similar manner also occur in the Dog (see fig. 192, c). In 

 Man, the Ox, and the Pig, especially in the larger species, the 

 .follicles are situated in the above-mentioned parenchymatous 

 and richly cellulated zone. They are more scattered in the 

 follicular layer, the interstitial tissue between them being more 

 strongly developed. 



In a large Graafian follicle (see fig. 191, d) we may dis- 

 tinguish a connective-tissue investing membrane, the tlieca 

 folliculi of v. Baer (2 5), which is composed of two layers, the 

 tunica fibrosa of Henle (50), or outer layer, and the tunica 

 propria folliculi. The tunica propria is lined on its inner 

 surface, in Mammals, by stratified columnar epithelium, form- 

 pC ing the epithelium of the follicle, or membrana granulosa of 

 authors. The epithelium (see fig. 191, i) is collected into 

 various-sized masses, at one or more points, according to the 

 number of ova contained in the follicle, which project into the 

 cavity, and constitute the discus cumulus proligerus, the 

 germ plate, disk, or eminence (Keimscheibe, Keimhiigel). An 

 ovum usually lies in the middle of this discus proligerus, whilst 

 the remainder of the follicular cavity contains a clear fluid, 

 the liquor folliculi. 



The tunica jibrosa is composed of a thin layer of ordinary 

 fibrous connective tissue. The highly vascular tunica propria 

 consists of young connective tissue, rich in cells; the cells are 

 usually fusiform and stellate, but many are spheroidal, and re- 

 semble amoebiform cells ; in these, when vermilion has been in- 

 jected into the vessels, particles of the pigment maybe discovered. 

 These layers are indistinguishable in the younger follicles ; the 

 epithelial layer with the ova here simply lies in a spheroidal 

 cavity of the stroma. Like Henle (50), I have been unable to 

 discover the presence of a structureless basement membrane in 





