..."The migration or importation of slaves into theUnited States or any of the Territories thereof,from any foreign country, is hereby prohibited... 
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
...The older "Aryan" theory assumed the migration into Europe ofone dominant Asiatic race of civilized conquerors, to whose bloodand influence all modern culture was due...
W.E.B. Du Bois 「The Negro」
...After a lapse of perhaps thirty thousand years there entered Africaa further migration of Asiatic people, Negroid in many characteristics,but lighter and straighter haired than the primitive Negroes...
W.E.B. Du Bois 「The Negro」
...North of the Zambesi, in British territory, the chief role in recenttimes has been played by the Bechuana, the first of the Bantu toreturn northward after the South African migration...
W.E.B. Du Bois 「The Negro」
...The hundredsof Negro tongues or dialects in the north represent most probablythe result of war and migration and the breaking up of ancientcenters of culture...
W.E.B. Du Bois 「The Negro」
...The Mohammedan slave trade meant the expatriation orforcible migration in Africa of nearly as many more...
W.E.B. Du Bois 「The Negro」
...The Colonization Society encouragedthis migration, and the Negroes themselves had organized the Canadianexodus...
W.E.B. Du Bois 「The Negro」
...The Doukhobors: Their History in Russia; Their Migration to Canada...
Various 「Mother Earth, Vol. 1 No. 4, June 1906」
...The winter migration came from the Dakotas, and was believed to bedue to the extra severe winter, and the scarcity of food...
William T. Hornaday 「Our Vanishing Wild Life」
...The loss occurred practicallyall along their east-and-west line of migration, from Arkansas tothe Atlantic Coast...
William T. Hornaday 「Our Vanishing Wild Life」
...As such migration is likely to happenwhenever a species becomes extremely abundant it probablyis Nature's way of providing for an extended foodsupply for the succeeding generations...
Clarence M. Weed 「Butterflies Worth Knowing」
...There is, however, a regularly recurringannual migration on the part of some butterflies which isalso a phenomenon of extraordinary interest...
Clarence M. Weed 「Butterflies Worth Knowing」
...ThisThrush has, I believe, a partial migration in Buenos Ayres...
P. L. Sclater 「Argentine Ornithology, Volume I (of 2)」
...Further south their migration is more strict; and on the Rio Negro,in Patagonia, from March to August I did not meet with a singleindividual...
P. L. Sclater 「Argentine Ornithology, Volume I (of 2)」
...I had never beforeobserved any later or supplementary migration like this; for, as a rule,the causes which in some years delay the departure of birds seemsto affect them all alike...
P. L. Sclater 「Argentine Ornithology, Volume I (of 2)」
...In the Buenos-Ayrean district it probablyhas a partial migration, as small flocks are seen to arrive in spring; butfurther south, in Patagonia, it appears to be strictly resident...
P. L. Sclater 「Argentine Ornithology, Volume I (of 2)」
...These birds have no migration, but pair for life, and always remainon the same spot, and will continue to breed in the same hole for manyyears, even where they are frequently deprived of their eggs...
P. L. Sclater 「Argentine Ornithology, Volume I (of 2)」
...From your text andreference books find other examples of migration...
Worrallo Whitney 「A Guide for the Study of Animals」
...A small stream west of the swamp seems to be used as a migration route to and from the swamp...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
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