intermigration

Traditionally there were 50 small Latin communities which were united by common Latin cults and by the common Latin rights of intermarriage, contractual dealing, and intermigration.

b. The Peoples of Italy 2001

But after very long intervals of time, and after great geographical changes, permitting much intermigration, the feebler will yield to the more dominant forms, and there will be nothing immutable in the distribution of organic beings.

XI. On the Geological Succession of Organic Beings. On the Succession of the Same Types within the Same Areas, During the Later Tertiary Periods 1909

And this continuity of the circumpolar land, with the consequent freedom under a more favourable climate for intermigration, will account for the supposed uniformity of the sub-arctic and temperate productions of the Old and New Worlds, at a period anterior to the Glacial epoch.

XII. Geographical Distribution. Dispersal During the Glacial Period 1909

But there was also long established communication and to some extent intermigration between the west coast and Mohammedan countries such as

Hinduism and Buddhism, An Historical Sketch, Vol. 3 Charles Eliot 1896

On the other hand, it cannot be denied that intermigration has also its drawbacks; that it will easily flood the labor market so as to screw down wages; it will foster the venturesome spirit, induce people to risk a certainty for an uncertainty, and especially has it tended to draw people from the rural districts to the large cities.

The Arena Volume 4, No. 22, September, 1891 Various 1888

Admitting these highly probable connections, no bridging of the Atlantic in more southern latitudes (of which there is not a particle of evidence) will have been necessary to account for all the intermigration that has occurred between the two continents.

Darwinism (1889) Alfred Russel Wallace 1868

Malayan and all the Asiatic races, from the Papuans and all that inhabit the Pacific; and though along the line of junction intermigration and commixture have taken place, yet the division is on the whole almost as well defined and strongly contrasted, as is the corresponding zoological division of the Archipelago, into an Indo-Malayan and Austro-Malayan region.

The Malay Archipelago, the land of the orang-utan and the bird of paradise; a narrative of travel, with studies of man and nature — Volume 2 Alfred Russel Wallace 1868

And to this continuity of the circumpolar land, and to the consequent freedom for intermigration under a more favourable climate, I attribute the necessary amount of uniformity in the sub-arctic and northern temperate productions of the Old and New Worlds, at a period anterior to the Glacial epoch.

On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life 1859

And to this continuity of the circumpolar land, and to the consequent freedom for intermigration under a more favourable climate, I attribute the necessary amount of uniformity in the sub-arctic and northern temperate productions of the Old and New Worlds, at a period anterior to the Glacial epoch.

On the Origin of Species~ Chapter 11 (historical) Charles Darwin 1859

And to this continuity of the circumpolar land, and to the consequent freedom for intermigration under a more favourable climate, I attribute the necessary amount of uniformity in the sub-arctic and northern temperate productions of the Old and New Worlds, at a period anterior to the Glacial epoch.

On the Origin of Species by Means of Natural Selection or the Preservation of Favoured Races in the Struggle for Life. (2nd edition) Charles Darwin 1845