21^2 HECIIKHCIIKS SUH I.V (:OMI>(>SITION 



li('i-(", ;i la suilc (Ic la vrsiculc dc iMirkiMJc vi du (•(.rpiisciilc dc Wai^riici-. 

 i;(cur (111 Disloma n/f/noidr.s sc pivic hml |)ailiciili(''i('m(Mil a roliscrxalioii 



dcs prcniicis |)li('"ii(iiii(~'ii('s ('nihrxoiiiiaircs. II est cMitiuckh'IiI |>clil, el cor <- 



Ic d(Mil()|)las!UO <)(TM|K« Tui. d(-s |)6l(',s (Ic Wvui, Ic i.^cn.ic pai-lailcnHMil lians- 

 pai-ciil a|)|»arail a raiilcc j)('.|c avcc imc iiclIcK' adiiiirahlc. On |>ciil(>l)scivcr 

 a\cc line -raiidc Cacijih' loiil, cc (|iii sc |)n)(liiil dans ccllc ccllidc |.n.lu|.las- 

 mali(niccl N<.iilcini(!(>()l(> sc diviscr, Ic iK.vaii sdivir l»i(>iil('>l la division do 

 Udclcolc, cnliii la ccllidc lout ciili('>rc donncr naissancc, en sc divisani, aii\ 

 (lcu\ jtrcniici-cs ccllidcs cnihrvonnaircs (pi. II, li-. I\ H snivanlcs). 



La division dc la \csicnlc j^M-nninalivc a done cic conslalcc (Finic lacoii 

 positive cli.-z iMi boil noinl.n" (raniniaiix appai(cnanl a divcrscs classes dn 

 iviiuc animal. Mais pcnl-on (iier dc la la conclusion, (pic la division dc 

 la v('sicnlc i^eiininalivc csl (ui plKMioiiK-nc i,^(>n('ral, el (pic sa dispaiilion n'csl 

 (prune simple apparencc!' 



Si Wm coiisidcic ipie, d;ms Ics divers i-roiipes <pie nous avons ('tiulies, le 

 -ci-iiic sc loi-mc pailoiil ilc la mi'inc maiii(''n', (pic loiijoiiis il consisic cii line 

 cellule pi(.l()plasmali(pie avail! poor novan la N('siciile i^ciniinaliv c, on sera 

 loiil iiaKircllcmcnl porle a croire (pie parloiil ccllc cellule sc conduit dc la 

 liK'ine inaniere pour lormcr Ics premieres cellules de rcmbiyon; el si, chez 

 eerlains aniinaiix, la mnlliplicalioii de la cellule c Mice par ccllc dc son 



partonl, pnisipic paiionl le bnl ;i .Ulcindre est Ic iik'HIc : lonjoiirs il s'ai^nl de 

 former des celhdcs aii\ depens (rime UKMiie cellule iikmc. On vcrra ipie I elude 

 des premiers pIicikmikmics einhrvonnaires vieiil a rap|)iii de ccllc propositi(Mi: 

 (pielipic \aries(prils soieni en apparence, ils consisleni loiijoiirs cssenlicllc- 

 ineiit dans la iiiiiMiplic;ilion p;,r division de la cellnle-ienr. La mali.Vc deiilo- 



|»lii.siiiati(| le ToMir poorra prendre pari a ccllc divisi(.n, on rcsler en 



dehors dc la cellule peiidanl iprcllc sc di\ise; inais lonjoiirs la cellule pro- 

 topl.'ismali(|iic sc divise cl r'cs/ /oiijoiirs an.r drpms dii pmlopln^^mc <lr la 

 ('.ollvlc-iviif </,ir sr foniic Ic (vrps drs pn'inicn's rrllidrs riidjri/OHiKi./irs. 

 \ priori on sera porl(' a admellre, (l(''s lors, (pic le iiuf/aa dr la crllalr-a'af 

 fonniil, en sc dixisaiil, Ics aof/aii.r drs (■clliUrs nid>n/nnnain's . alors siirlonl 

 <|ii(i roljscrvalioii dirccic a (b'lnonlrc ipie, dans c(>rlains cas, Ics clios(!s sc 

 passcnt coinrne nous venous de Ic dire. 



