••■/•///•; onniis .\m> i'aoij rios or Lii-i-y 



v^:^ 



I'volniiim niitl tlu' rcviM'tl Darw iiiinii 

 liy|>iitli«->i< llial irtTin-fVolulioii is |tri- 

 iiiiirv Imt imdircclcil. .-iikI Im»(|\-c\iiIii- 

 I imi >r(nii(liir\ . I If liitl(l> 



"tliMt <iiir M ;ircli fur ciinsrs iiui.-l inn- 

 (•(■(•(1 iilnii-j till' line of (Iftcrmiiiin^' 

 wliifli attii'iis. rcacl ions, and inlcr- 

 aciiiin> iir.arialily iircccdc and which 

 inxariahly rollow — ihnsc of the hody 

 cclU ( l.ainarckian view) or those of 

 thf ihroMiatin ( Darwiii-W'cisniann 

 \ic\\"). The Laniarfkian view tliat 

 adaittation in the hody cells inmri- 

 iihli/ jirecedes similar adapt ixc reac- 

 tion in ihe chronnilin i> not >n|i- 

 porled ''itlier l>y experiment or hy 

 ohMTvalitm : >ncli |)reeedenci'. while 

 occasional and even rre(|nent. is liy 

 no means invariahle. The l)ar\\inian 

 \ ii'W. nanielv. that chronialin evolu- 

 tion i> a matter id' chance ami di>- 

 ]ilavs it<''lt' in a variety of direcii(ni>. 

 is contradicted hy paheontolonical 

 evidem-e ])o\h in the Invertehi-ata and 

 \'ertel»rata. amoni:" which we oi)serve 

 that loiiliniiil 1/ (iiiil htir in cliroiiinliii 

 rrnliihiiii /in'rml orrr llir I'riih'iicf 

 rilhrr nf fortitili/ or of siidtlcii Icdjis 

 III- iiiiihilioiis. that ill I III' i/i'iir.^i>i of 

 iiiiiiii/ rlhiniclcrs llirrc is ii sloir iniil 

 jiroloiit/i'il ri'i'tii/riiifiil ion or di rrcl cro- 

 I III ion of llio rli roniiil in hnrnrd iiihiji- 

 lirr mils. This is what i> meant in 

 oni- introdnction hy the statement 

 that in evolntion law ])revails over 

 chance." 



The chapters on the evcdntion of the 

 vei'tchrate cliisses are a hri<'t' and ilhi- 

 minatiiiir survey of a field of the iii-cal- 

 est ]>opiilar and M-ientilic interc-1. 

 which has hitherto lieeii aecessihie (inly 

 to the speciali>t. Tlii- part id' the -uh- 

 ject lie- within the anllioi'^ uwn Held 

 of research. an<l has >pecial intei'ot on 

 that account. It is illu>trated with 

 many heautiful reconstr\ictions and 

 «lniwin;:s of extinct forni> lia^'d on the 

 rich collections of the .\merican Mn- 

 >enm <d" Xatnral IIi>torv and other 



MMirces. In the work he has had ihe 

 coHahoralion of Dr. \V. K. (irej,'ory in 

 the recon-t iiici ion>. am! the .-killfnl 

 animal arti-t ('liarle> 1{. |\in;.dd in the 

 drawiiiL^s. 



The cMiiie i;i'a|)hie and fascinalin-f 

 presentation uf the history id' life n|>on 

 the earth i- >iich a> (ndy a ma>ter in 

 pala'ontoloL;\ could |)resi'nl. Tliethectry. 

 thertd'ore. naturally coneeni- primarilv 

 thei;real e\ olul ionai-y movement-. The 

 wi'iti'r. howe\ei-. c(m>lantl\ emplia>i/e- 

 the principle, i hat the Lireat e\.ilnt ion- 

 ai'\ e\enl- and tendencies that may span 

 million- of years are the resultant <d' 

 ihe elem'entarv laws <d" liioloi^y. I'lUt 



he (loe> liol .-(llempt to utili/.e >Ueh hlW.- 



in I lieiii'ct ieal eiiii-i I'licl iiiu. hul rather 

 for Mlii-I ral mii urieii nf an cxceedinLily 

 apt clia I acler : an example i> 1 lie appli- 

 cal juu 111' hormone i lieoiaes to explain 

 certain ilianuc- of propdrtiim n\' part> 

 in the cMiliilion of mammal-. The law- 

 of inliei'itance and (d' expei'imental hi- 

 olo^N with relation to evolution are. 

 lioweNci'. to fiii'm another vttlume of the 

 same -erie- li\ l'r<d'e>sor ('oiiklin. 



\\\ \iiiue ol' it> \er\' riiidi' and coni- 

 pl'ehensi\Clle-- the hook leaxcs u- willi 

 a -eu-e of almost inlinite inadi-ipiacy 

 liefiire the prolilem of (he ])hysio1o<i-y of 

 I'oiau and ( haraeter evolution. The 

 moi'pholo'^v of the pi'ocess we are hejiiii- 

 inni;' to know with some approach to 

 coinpleteni'>- in eei-tain ]ihices. Will it 

 ever lie po--il)le to trace the actions, re- 

 actions, and i iilei'aet ion> of Professoi- 

 ()-l)orn"> four couiplexe- of cuerLiy in 

 the cMilulion id' living- thini:--? Cer- 

 taiidv liel'ore ihi- can lie done the phy>i- 

 oloi^v of emhi'vonic development and of 

 hei-editv must he mucli farther devel- 

 oped. Hut to have surveyed for ns the 

 held from <o rich a fund of experieiue 

 i- a notalile ,-ervice |o that inte<fi-at ion 

 of -cieiitilic work which is so ijreat a 



need nf the |il'e>ent. 



