G INTRODUCTION. 



2" Si I'on coiiipiirc rdciif dii iii.'uimiilV'ic ;i\('c Icnif dc roiscaii. ccldi (rmi 

 Cruslace a\cc ccliii (run Tirinalodc, on oIimtn(> (l;iiis Iciir consiiiuiion (hs 

 differences Ires-grandcs. L'ccufdr i'oJM'aii a cic W\n\ dcs loi-, coiisidcicconinK' 

 I'analogiio do la capsule dc do (Jraaf dc^ niainniilV>iCN, cl an piTini(>i- ahoid 

 on no (ron\o (pic jicn d";iiMlci;ic ciilrc I'lnd d'un Trcnialoih- on (run (k^loido 

 el celni dcs aulrcs aninianx. 



lAI. Scliw.nin pi(»( hni.i Ic picinicr (pic l^ciil' c^l inic ccllnlc; cl nijanmoins 



non^ Ic M>\nu^ Idi-nicmc n^cMMiailic dans ic j; c dc Tn-id <W Toiscau 



dcs cclhiics (li-lniclcs; d nc pcnl drc niccunini (pic Ic %il(-lhis d,> IVnrdo 



hcancoiip d-aiiiniaiix Ndciicnis sc consliliic dc <rll(il(>. p,iH;.ilcni( •ar.ic- 



Krisccs. Ia' xilcllus (Ic r(ciil dc I'.tiscaii a-l-d mmi analo-iic dans Ic \il(>||iis 

 dc rc'iiCdc. iiiaiMiiiilcrcs:> \,„p,c| dc cc. iUnix iNpcs s,. .allachcnl Ic (c.il. 

 dcs ainm.Miv ndcncni^i* Oiicllcs analo-ics cl (picllcs dillcicn( c- c(Misial(>-l-.)n 

 cnli-c luMil dcs TrciiMlodc- cl cclni dcs annn,ui\ siip,-iiciiis:' (.Vsl ia s„|ii- 

 lion dc CCS (pic^li(,iis ipic MTlanic l\\cad(Mnic (piand (>llc dcniaiidc dc lairc 

 n.iinailic la ,omj>o.il/oH ilr hn,/ dans (liN,>,-s,.. das.cs dn n-iic animal. 



;{" One lanl-il ciilciidic \).u- ccs iiiols : A/i/urt icr In nit/iii/iro/ioi) do I'tviif 

 rl (Irs ihrci srs j,(n//r.s ^n/ ir niiish/iinil '/ 



Non> ci(»\(Mis (pi(. ,-,• su/iu/i<n/H)ii cs| siisccplihic d'nnc donldc inlcr- 



pivlalion : on pcnl dclci-nniicr ia sjiiiiilicalion (Oiiijxiraf/rc dcs (nils cl dcs 

 clcniciils d(Mil ils s,> coii-lilncnl, cc (pii doil icss„rii,- d,. r,.|„,|,. ,|rs analo-ics 

 ol dcs didci'cnccs epic ic^ (cnK |)icsciiicnl cnlic vu\. I.c dcnic dnnporlaiicc 

 dcs diverse^ parli(\s csl (hrcclcnicnl ( n ia|>p(ii'l .i\cc ic dci,M'c Ac consiancc 

 (pic prcscnicnl Icnr mode dc lonnalion, Iciir consiiinlion d Ic toic (picli(s 

 jonenl, pcndaiil (pic sac, (miplissciil Ics picmicis pliciKmiencs cinhnon- 

 naircs. 



Mais on pcnl anssj dciciniiiici |a M-mdcalion ih- I \ciii ci dc^ di\cr^"s par- 

 lios (pii Ic consiiincnl, rclalncmcnl a l.i ccilnic, (•"(si-a-dire, rel.ili\cmcnl a 

 l'(3l('nicnt conslilnlif dcs lissns oi'ganis(38. Dans nn livro (pii rcslcia un d(vs 



