RECHEHCHES 



COMPOSITION ET LA SIGNIFICATION DE L'ffillF, 



SIJU L'ETUDE DK SON MODIl \)E I'OltMATlON ET DES PREMIERS 

 PIIENOMEINES EMDRYONNAIRES. 



PREMIERE PARTiE. 



KXPOSITIOIV DKS FAIT8. 



VERS. 

 I. — TRliMATODES. 



HISTORIQUE. 



I. — i()ini\ri().\ I.I coNsiiTi DON i)i: l oia r. 



J)(''s 1S;^o on i\ coiiiiiicikV' ,'i -^"occiiprr xTiciix'iiiciil dc l'oi-:niisalion dos 

 V(M's <-l siMviiilnnnil .h's Tn'm;.l(n!.N. .^.(riilis, Laiiivr, ^^.m \V,wi, son Xord- 

 i„;mii, niliii I'.iinncisl.-r, ,v.;.iciil l;iil. JMrli- (M)n:jii.', el a drs inlcrsallrs pen 

 <'loi-n('s, dc^ IravauN siir laiial.mnc dv (•(Naniiiia»i\. .Mai> aiicini d.' crs n;,- 

 luralislcs n-a\ail ircoiimi la \iai,' (oiHliKilioii dc |-ai)|)anMl s,.\(U'l : !<•< xilol- 

 loiiTiK's ("laiViil (■(.iisidriV'S coiiiiiir on aires. I.v. \ ilrlloducK's nMiinic iilenis , (!l 

 la pmiioi, |(-niiiiial(- de tv^ caiiaiix ("xcirlrurs coiiiiuc o\isa(N. Tons n"^ an- 

 Iciir.s admcilaiciii lV\i>lciic(' d(! Irois loiliciilcs, coiiruiulanl Ic gormigoneaxec 

 Ics i^landcs M-Micll.'s <iiah-. 



