350 TiiK Kvoi.ii'rioN 'riiKoiv'Y 



yii'ld l\>ri.ilo doHCoiulinitH hIiouIiI ho hchio'IiI Tor liy croNNiiiE; iSnu'rinl/ni.tt 

 (H'(IJ(tlt( with oiu> ol' tlu'so AiiuM'ii'iui s))(H'ii>H if \l is to liiivo iiiiy 

 (,ltH'i.si\i> viihu'. 



l^\])iM'imi-ntiH of (ilu> HjniHi kind luivo bcon miwio liy SliaiuiruHH wil-li 

 (lilloi-iMil, Hpocii'M ol' iiulio'iMKiuH ^'((/■(((•((/(f, 1111(1 Mi(>M(> hiivn hIiowu noli 

 only that croHHiiii;' is |)os,sihl(\ hut tliiit tlu^ hyhvitlH iiro I'tMiiK* in their 

 tvtru. 'riu\sii rcNultM ii,ri> to ho vjIiIiumI tlio luoro hi.ii'hly liocnuHo it is 

 well known tliiit hopidoptorn,, niul (^von tho iiMiuUly prolilic Milk-niotliM, 

 (1(1 not rojidily n>pi-o(liu'o in ciiplixitiy, o\'on within tii(> Hiinio ,s|H'('i(>H. 

 Wo liiivo in Sitliiriiia pi/ri, t</iiiii, luul I'lirpliil thr(>(^ woll-niarU(>(l 

 (liHtincti Hpocios with no intornu^diiito ronuH in natiu'o, and willi (piito 

 dirtor(>iit colourinn- in th(( ('iii(>rpilla,i'H. 1'liM.t thoHo .should havo ho(>n 

 HUoooMsrully oouihiiuMl iu a triplo hyhrid proNCH at loaHt that h(v\umJ 

 alionaiion oaniiot liavo adNiuicod \';\.v in this cn»i\ 



Wo iiniMt hi>wiirro, liowo\dr, ol' airtrihutinj;- too nuioh to th(> con- 

 •stant mutual oroHHin^' whicli occ.urH in a H]H>('ioH liviiifj; on a O(inno('t(>il 

 ai'oa and ol' ro^'ardiiiif its inlhion<'(\ an irr(\siMtihlo. Undonhtodly it 

 uniHt ;j,'o I'n-r liOwardH H(H',urinj;- tho uiiil'oi'niity of iiidixidualH, lint not 

 only i.M it luiahh^ Iro achioNc tluH, liut it caiiiiiot MUccoMHrnlly r(>Hi,Mt I, ho 

 Ktron^i'or inllnon('(!M iiiaikinn' for variaJion which ma.y ho oxortod upon 

 a jiai't ol' ('ho a,r(Mi, ol' tho HpooioH. Wo liaA'o a.lroaily noon thai it in 

 (piito orroiuMiiiH to HiippoMo that ovoi\y now adaptation iiiust ho IohI. 

 .si^^'lit ol' a,jH'a,iii hooa-iiHo ol' tho continual croMHin;^' with other iiu'ihIkm'H 

 ol' the HpooioH upon tli(< Ha,iiie a.i'oa-. OlJier thiii^'M h(>inn' (■(pial, thts 

 dep(^ndH untirol)' upon the iin|iorta,nce ol' the nihiptaiion in (pi(\Mtion. 

 .luwt a.H cliniaiio iiilliioiioeH may he ho wtroiif;- tluit they entirely o\'or- 

 oonio the inlluonco of croHniiin', mid eive riMo to n^ local race notwith- 

 Htaudiii^' iiiijioi'roi^t ^ooffi'M'l'hica.l iMohil-ion, ho the Ha-iiio may Iwippon. 

 in tho cano ol' ndapta-tionH. It in (piito coiic(>ivaJilo tlia.t the [lolar 

 ha,re of iSciMidina,via, iiuiy Iwivo evolved a vvlio!(( Morion ol' ni,c(\M, ea-ch ol' 

 which iiS ada]ito(l (,o tho diirartiou of the huow in itw /^'oon-i'aiiihica-l 

 raii(^(\ althoii^'li a (U'oHHiiiff of tliewo (piic.k-root(Ml aniiiiaJH nniHt I'ro- 

 (piontly occur in tho (M)urH(( ol' tiiiio, even m.h rojj^'anlH I'ovniM rroni \vid((ly 

 Hoparati^d aroaH, and althoufrji, IJio whole i'e;;'ion Ih injiahitod wilJioiit 

 a hn^ak hy tlie HpocioH, Ho tlm,t a, ' iniiifrlinjj; ' ol' tlie lia.roH of all ron'iouM 

 I'roiii Houth to north, and (Mjnvoi'Holy, may ta-ko ]ihKio, a,nd IikIikmI 'iii,nd 

 ho contiinuiJly taJ<iii^- pla,co, thouj^'li ol' conrHo s'ory nlowly. 



It Ih preciwily I-IiIh (ixtrenio nlowrujHH with which the iiitor- 

 iiiirifrliiif;' of raciaJ (diaract(!rH tn,ko pla-co thaJ, HeoiiiH to mo oHHontial 

 for the production ol local or, aH in tliin caHo, r'oj^'ionaJ racoH. It Ih not 

 dillicult to cidcnlate tho rate of ' hlood iliHti'ihntion ' if wo n,HHiimo tlia,t 

 th(! conditioiiH \'i)V a, rapid diHHomination are aH i'avourahlo aH poHHihlo. 



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