NFJ'li'OI'TI'h'A AND ('(U.h'.orTKi; .\ 



•2U7 



ji point ahoill. tvvo-lluids llic (listnncr (ow.ikI IIic itciiplicry. Al tlic 

 lliiilictli hour (hey appeal- in Ilic pciipliciy |)ii( i|iiili' widely sepnialed 

 iVom one anolher. Maeli dixision diiiin;^ (liis nii[!,r:it ion lias jiccn 

 synclii»)nou.s, hut \('iy lew spindles appeal', most of I he nuclei hein^ in 

 (he prophase or in (he resting s(a|!;e. 



Duiiiifj; ('U^HVH>i;e, (he remaining polar hody ^rows \'eiy lai^;e, several 

 (iines the si/e of [\\v (^lenvu^:;e luielei. In all eases a nuclear wall (o w Inch 

 (he chroinaiin inH((>rial ((>l\(ls (o adhere can rea(lil\' he seen. Alter the 

 very earliest, stages of pohir-hody lonnalion the cliKunosonies lose their 



o 





Kid. -S.iH. Knirhi/rhiniiH DiHinti 



h.i ImmIv (/-A). ('•(•) rUmvnui 



characteristic form and apjiear simply as a large mass of irregular threads, 

 much more in (|uantily than in the nucleus. In some eases the polar Wody 

 has heeii ohserved (-<) divide, hut no spindles are formed, a large portion 



of the i)ola,r hody splitting off and a mass of clir a.tin mat.-rial passing 



from one part, t,o the other. The polar hody s<.met imes ivmaiiis as a large 

 vacaiolat.ed cell in which the chromatin material gra.dua,lly (hsintcgrates 

 and (hsappears. 'I'his process cxt-eiids over a considerahle period. 'The 

 polar hody is sfill discernihie in fhe yolk at 'M) hours when the cleavage 

 nuclei hav(^ alrea,(ly rea,ched the peri|)liery (l^'ig. 2:W). At the 'A'J, hour 

 H(,age, wh(Mi (here are many moni cleavage nuclei in (he periphery hut, 

 l)ofor(! any (•('!! walls hav<' fornuHl around fli(!in, a large; mass of cyt,oplasin 



