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Intermigration, in-tėr-mī-grā′shun, n. reciprocal migration.

It was therefore almost certainly united with Greenland, and probably with Europe by way of Britain, in the early part of the Tertiary period, and thus afforded one of the routes by which that intermigration of American and European animals and plants was effected which we know occurred during some portion of the Eocene and Miocene periods, and probably also in the Pliocene.

From what we know of the long geological duration of the generic types of these groups we must certainly go back to the earlier portion of the Tertiary period at least, in order that there should be such a complete disseverance as exists between the characteristic animals of the two countries; and we must further suppose that, since their separation, there has been no subsequent union or sufficiently near approach to allow of any important intermigration, even of winged birds, between them.

This court have determined that the intermigration of slaves was not committed to the jurisdiction or control of Congress.

It is a settled doctrine of this court, that the Federal Government can exercise no power over the subject of slavery within the States, nor control the intermigration of slaves, other than fugitives, among the States.