No. 484] 



( lObhl^i RI I MED .SPEC IIS 



we consider that sufficient change has occurred to w{ 

 epithet 'new,' as apphed to the conchtion of tlie ^n-ouj 

 that the new species has risen upon stepping stoiKvs o 

 self, since the survival of the fittest has had its convc 

 extinction of the unht — that is, the 'old' spec ics 

 the given area only a single new species is louml rc[) 

 vanished old one. For any given area of conijuMiiiDii 

 forming effect of Natural Selection then, is moiiolvpic. 

 ( 06, ch I ) cleaih states the truth that Natiii il -iUi 

 out isolation effects monotvpic evolution, and oiiK hv i 

 isolating factors of some kind resuhs m poh i \ pic < 

 Nageli's earher exposition of the monoiN pic ctlcct ot 

 Selection was explicit (Naueh. 7;)). 



Ontheothei li iiid Mm ition I.k ik. rh( .puu^ ind 

 rily at least, must o-iv(^ a polvtvpic aspect to the urtttip 

 specific area. I'lic pari'iit species is conteinjxiraiieoiis 

 new spcdes to uludi ii ^n(^ iim 1 lu lu u ui.l iIh < 

 side In- side for a linuv wiilicut n(,,oTapliic iM.laiion and i 



AMthont Lolninll „l IMX MMI llll^ 1> iIm pillllin < 



Subseeiiienilv c,)nipetiti..ii niav leave onlv .nie ..f tli. 



to f^o^\nll^ (.1 l.Mchim tiiiu i phx moIcuk d iM»]iti.m 

 the imin(<liU( k Milt ..t Mm itu.n l',iit is , mh tlu 1 

 of Mutation iim>l certainlv he tlie allocation of r\o<vh. 

 species, or kinds, in tli(> same area wiiliont anv M)rn 



If ^^e compau ( )i ihojuu ^i. utm^ uihK i .md 

 enMronment, XMtli \ itin d ^(Uction on til. <'i . hind 

 tion on the other, we sei^ that ( )rtlio<:-eiiesi> must in ma 

 agree with Natural Seleciion rather than with Mutation 

 cerns the distrihulion of us ])rodncts - >pecies. 1 hroi 

 single region of unitoini < , oloi,i< .1 . Inr u t. i ilu ( tlu i ot 

 mental moiildmo. so-called, upon a u-i\eii ori^amc siock 



geographic district, as tliev alwavs are when the surtaee i. 



