im: * , THE M: 



377 



surrounding c<>nnecti\.- ti.->u-. carrying with it the blood-vessels, 



grows into the egg-tubes oi i ml tin- n- i. and 



divides tluMii .-ill into -plieroidal bodlM, tin- indhidual h.llicl'-s (/). 

 Kach siu-h >trueture contain^ a -in^le ovum, that is enveloped on 

 all .sidex l,y a layer of i'<illici;l;ir cells. Tin- vascular connect iv.- tissue 

 that i^iows aroiinl it becomes tin- t't'llieular membrane or 



fotticuK. 



The iv. solution into 1'ollicl. > ci.nt inually atl\am-t-> 1'ruin the me- 



c.sch, 



' > 



Fig. 216. Part of a sagittal section of an ovary of a Child just born, after WAI.DEYER. Highly 

 magnified. 



miriiil fpitlioliuin : f.scA, PFLUGER'S egg-txibes ; wf, primitive ova lying in the germinal 

 piih.-lium ; e.tch', long PFIA'CER'S tubes, in process of being converted into follicles; 

 et.6, egg-balls [nests], likewise in process of being resolved into follicles ; /, youngest follicle 

 already isolated ; gg, blood- vessels. 



In tli.- tuU> an<l egg-nesta the prinmnlial eggs are distinguishable from the smaller epithelial 

 cells, the future follu-ular epithelium. 



dullary sub.stancr toward the germinal epithelium j however, there 

 an- jnvs.rvrd undt-r it for a long time Pfliigerian tubes, \\liich 

 remain in connection \vith it l>y means of narrow epithelial cords 

 (e.SC//) and contain ^^> in pn>rr<> ot' developmetlt. 



The formation of new PtliiirtM-iun tubes and young ova i- 

 process which continues in the lower Vertebrates throughout lift-. 

 but in tin- hiirhrr apprar> to be limited to the period of embryonic 

 development, or to the first years of life. In the tir.M case, there 

 being an unlimitMl .-apaclty for the formation of new structure 



