. The introduction and spread of Pieris rapae in North America, 1860-1885 [ 1886] [microform]. Butterflies; Cabbage; Papillons; Chou. .^^" i k III. TlIK TnTKODUCTIOX AM) Sl'RKAI) OV PlKKlS UAVAK fX NoKTIl A-MKltlCA, 1800-1880. With a Map (I'latk 8). By Samuki. II. ScuDDKii. (U.'iul Miiy 1, 1887.). XT is woll known that the difTi'i-cnl vacv» of nun Inwo not alwiiys occnpiod tho regions â \vhioh tlicy now inlial)it, bnt tliat IVoni tlio carlii'.st times one wave of migi'ation has lol- lowcd another, in a manner tliat has proved very perph'xing- to tlie ethnologist attem[)t-
. The introduction and spread of Pieris rapae in North America, 1860-1885 [ 1886] [microform]. Butterflies; Cabbage; Papillons; Chou. .^^" i k III. TlIK TnTKODUCTIOX AM) Sl'RKAI) OV PlKKlS UAVAK fX NoKTIl A-MKltlCA, 1800-1880. With a Map (I'latk 8). By Samuki. II. ScuDDKii. (U.'iul Miiy 1, 1887.). XT is woll known that the difTi'i-cnl vacv» of nun Inwo not alwiiys occnpiod tho regions â \vhioh tlicy now inlial)it, bnt tliat IVoni tlio carlii'.st times one wave of migi'ation has lol- lowcd another, in a manner tliat has proved very perph'xing- to tlie ethnologist attem[)t- in^ to follow them. That the lower animals also have had their migrations has been frequently proved by the ocetn-renee of their remains in regions where they are not now found. Soenlar ehange of elimate has been the great moving cause of most of the migrations of which we have any knowledge, with the single exception of the inlhienee of man, and particularly of civilized man; he is everywhere upsetting the arrangements of nature, directly or indirectly extei-minating all forms which cannot endure his i)res- enee or withstand the baleful influences which follow in his train. To minister to his Avants, for instance, he brings into a new region a ])lant fori-ign to its soil that he may have the fruit ready to his hand. Without the natural hindrances which prevent iis supremacy in its native home, it thrives so vigorously, if otherwise ada[)ted to the place*, as to supplant the natural denizens of the soil; these are supporting numerous animaN, which in their turn suffer. So it has doubtless been in all aj^es (*f the world, where by any of the nndtifarious means which nature employs she has hei'self upset the balance' she had established, by bringing into a flora or a fauna somi' new eleuient, from without. liwU-ed. the history of animal and ])lant life has been a story of colonization. Any one who has observed the I'apidity wilh which weeds spi'cad ovei* new countries, has re
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbutterf, bookyear1887
