The book Variation in Animals And Plants was written by author Horace Middleton Vernon Here you can read free online of Variation in Animals And Plants book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Variation in Animals And Plants a good or bad book?
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napi. Thia hryonvs is in all probability the ancestral form of P. napi,, whilst the winter form, and *Tlie Eatomdogist, 1896, p. 240. f "TranamutationeQ der Schmetterliage infolge Temperaturaa- derungen," Berlin, 1894. t Trans. Ent. Soc. 189S, p. 72. g Trans, Ent, Soc. 1894, p. 4S5, 1 '■ Organic Evolution," p. 185. 940 THE EFFECT TEMPEEATUEE subsequently the summer form, of tbe common P. napt^ have probably arisen gradually from it through the in- fluence of a warmer climate. Now Weisniann foun...d I hat he was unable to convert hryonis into napi by the action of warmth, though he could by the application of' cold readily change the simuiier form of napi into the winter form. Similarly, also, the progeny of F. levami . are readily converted by cold into Umna, but only ex- ceptionally can the progeny of Y, prcrsa be converted into prorsa. Now, as already mentioned, hvana is probably the ancestral form, and so, in both this case and that of F. napi, cold readily produces what is probably a phylogenetieally older form, whilst warmth generally has no effect.
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