I IO 



THK PHYSIOLOGY OF REPRODUCTION 



energy, for it is incajwvhle of active movement. The metabolic pro- 

 068868 of the ovum, thrn-fniv. are alin-.st entirely constructive, while 

 those of the spermatozoon an? largely destructive. The function of 

 the ovum is to conjugate with the spermatozoon, and subsequently, 

 by a lengthy process of cell division, to give rise to a new individual. 



Kii.. -2\. Section through ovary of adult dog. (Knuii Waldeyrr.) 



iiiinal epithelium ; />. remains of egg-tubes ; /, small follicles ; '/, more 



ad\anced fdlicU- : . , discus |>ro]i^rnis and dvum ; /, sccnnd ovum (a i-are 



': i \lcinaoffolliclc; //, tlicca inti-nia ; /, mcmbrana 



: ii--iatf follicle ; /, blood-vessels ; ///, tlllies of jiaro- 



\arium ; /. involuted germinal epitlu-linm ; 8, transition from germinal 



: it"lie;il ejiithi'lilllll. 



maninialian nvary, 1 or organ in whir?li the ova are produced, 

 is coiujiosfd of a stiuina of fibrous coiinf(-tive tissue, which contains 

 B plain muscular fibres (especially in the neighbourhood of the 



1 See also Stratz, l)<-r -i- *<},!?, /,/.;-, ;/> Sfi<i>>tl,i<rr;.;-st< H 'l; Jlaag, 1898. 



