SP^GIES PtHD V/¥RIETIES: 
Their Origlri by mutation 
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Parti. Tiie Darwiman Theory; XIV-*' ----- >. 
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Fir-: II. PosT-Dar-winian QTjestions; Her«iity and Frility. • Is 
Vart nr. Post-Darvcinian Questions:; Isolation nnd Pliy«i(.l,>!-io; 
OS %'*itf«el:. traits, \ A. C!arir sxnr F A , -r«- 
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