75 



ation of the gerr layerr. 



CELL I.;ULTIFLICATION. 



DurinfT the er.rly cler.vr.pe rhasec 1 ho crlls rultir-ly 

 entirely by the procosE of ritosic. But i" the later rhasec, 

 esT^ecially vhen the egE is a-;:'ircachirg that r.tape in ';;hich 

 the cell l^cunclaries are lost, there is f^ord evidence that 

 direct cell divisicr ic aire ef freciient occurence. In this 

 reriod of develorrent ritosis and aritcsic take rlace sirul- 

 tanecusly i^ the different cells of the sep^-entinn cf,F.» -"icr- 

 iire 31a shov.'S a karyol-inetic s-:irdle in the •,ietar)ha:- ; 

 jij-;ure 31^ one ir\ the a-^a-r-'hase. The chrorcscr^es are larne 

 ard nroni-ert; but are toe closely rrrrded topether to be 

 cour-tfd • ith accurrcy. 



The nuclei v.'h^ch divide aritoticelly vary in si:!;e con- 

 siderably, ar^d havp a reticular a^'^earance. Fifur^ 3?a 

 shows a larr^ rucleur of this reticular chrracter vnth the 

 chroratin scattered rbcut in the lirin nrrhrorl:. Firures 



