276 



GENERATION. 



smallest Graafian follicles are from -g-J- to -^-J-^ of an inch in 

 diameter, while the largest measure from f- to ^ an inch. At 

 or near the period of their maturity, the follicles present sev- 

 eral coats and are filled with an albuminous liquid. The ma- 



Portion of a sagittal section of the ovary of an old bitch. a, ovarian epithelium ; 5, &, ovarian 

 tubes ; c, c. younger follicles ; d, older follicle ; e, discus proligerus, with the ovum ; /, epi- 

 thelium of a second ovum in the same follicle ; g, fibrous coat of the follicle ; 7i, proper coat 

 of the follicle ; i, epithelium of the follicle (membrana granulosa) ; follicle, collapsed and de- 

 generated ; , vessels ; m, m, cell-tubes of the parovarium, divided longitudinally and trans- 

 versely ; ?/, tubular depression of the ovarian epithelium in the tissue of the ovary ; 2, begin- 

 ning of the ovarian epithelium close to the lower border of the ovary. (WALDEYER, in 

 STEICKEK, ttandbueh der Lehre von den Geweben, Leipzig, 1871, S. 54o.) 



