Charles Darwin And the Origin of Species Addresses Etc in America And Englan
Charles Darwin And the Origin of Species Addresses Etc in America And Englan
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But many hundreds of specimens from different localities scattered over the total area of distribution re- quire to be examined from this point of view. An even more interesting inquiry would be to trace the range of the floridensis form northward and determine the relationship of its limits to the zone in which berenice becomes scarce and disappears, and above all to ascertain whether floridensis on the borders of its range interbreeds with archippus and how far transitional varieties occur. I...nterbreeding between the two forms, if possible, would be of extraordinary interest. It is also of importance to ascertain precisely how far the one form penetrates the area of the other. Scudder indeed states that floridensis ranges into the Mississippi Valley and Dakota, far beyond the limits of Danaida berenice. It would be deeply interesting to make an exact comparison between such specimens and those from Florida, and also to ascertain the proportion which they bear to typical arcliippus. By far the most important feature in the evolution of floridensis is the general darkening of the ground- colour, and the material for such a transformation certainly exists freely in archippus, for the shade of brown varies immensely and may often be seen of as dark a tint as in floridensis, but not in my experience of precisely the same shade.
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To quickly assess the difficulty of the text, read a short excerpt:
But many hundreds of specimens from different localities scattered over the total area of distribution re- quire to be examined from this point of view. An even more interesting inquiry would be to trace the range of the floridensis form northward and determine the relationship of its limits to the zone in which berenice becomes scarce and disappears, and above all to ascertain whether floridensis on the borders of its range interbreeds with archippus and how far transitional varieties occur. I...nterbreeding between the two forms, if possible, would be of extraordinary interest. It is also of importance to ascertain precisely how far the one form penetrates the area of the other. Scudder indeed states that floridensis ranges into the Mississippi Valley and Dakota, far beyond the limits of Danaida berenice. It would be deeply interesting to make an exact comparison between such specimens and those from Florida, and also to ascertain the proportion which they bear to typical arcliippus. By far the most important feature in the evolution of floridensis is the general darkening of the ground- colour, and the material for such a transformation certainly exists freely in archippus, for the shade of brown varies immensely and may often be seen of as dark a tint as in floridensis, but not in my experience of precisely the same shade.
What to read after Charles Darwin And the Origin of Species Addresses Etc in America And Englan?
You can find similar books in the "Read Also" column, or choose other free books by Edward Bagnall Poulton to read onlineMoreLess
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