Dl T8, 



21 



Why an the male .-sexual rell> s<> small ami t hread like, and SO 

 diHeivntly const ituted fn>m the 6 



The dissimilarity hetwerii the male and tin- female sexual o! 

 e\plained 1'V the fact that a division of lah >r lias arisen It.-: 

 two, inasmuch as they have ndaple I ill iu-eUe~, Lu dill- . 



Fig. 10 A and B. Initial stages of the metamorphosis 

 of the seminal cell into the seminal filament, 



il ,-,-11 with |.i ar-.-li.-ii.f.l inirl,-us; /;. .s,-iiiin;il 

 n-11 v.ith COM sli.-ipol nui-leus ; -c, .sniiinal ct-11 ; t-, 

 nucleus with i-hnniKitiii nrtwoik. ;u,d inirk-oli (n) ; 

 mst, boil> out of which tin- niiikiK- pin-.- isdevt-li-i..-.! : 

 .stiucture, which is in o>ntact with the 

 i>it-i.v. ;ind is cl.iinied t<> hav.- r.-latinn to the 

 foi-inati..|i ..f t!,.- .-piial iiu'inhraiie of the tilaiuciit ; 

 ', caiul.il ai'i'riuh. :i.il tilaniciit. 



i- 



mil 



Tig. 11 A and B. Two terminal 

 stages in the metamorphosis 

 of the seminal cell into 

 the seminal filament, nft-r 

 FI.I MMI v;. 



Jc. Nucleus, whicli 

 i'1'.uuati-.l to form the head 

 of thf sp.-imato/.>i..n ; mt, 

 it? iniildK- im-cf ; /, iu 

 ; ,1 tilatiiciit. 



The female cell lias assumed the function of supplying tlu> sult.i 

 which an- n'i-r>^iry for that nutrition and irrowtli of the cell proto- 

 ]>la>m whii-h a rajml acroinplisliincnt of the process of development 

 demands. It has thrivfoiv, while in the ovary, Mon-d up in itself 

 yolk-SUbetance, reserve material, for the future; and ci)n>Mju'iitly 

 has Income lai'ire and incapal^o of motion. But ina->mnrli I 

 is iiiressiry for the a<rom{>li-hiiient of a process of development 

 that union with a >erond cell from another individual should take 

 plare. and simv non-motile bodies cannot unite, therefore the male 

 element has heen siiitahly modilied to meet this second requirement. 



