On the contrary, the effect of the inflow of adult migrants is very marked, as is to be expected, in the returns for the new countries, such as the United States, Canada and Australasia.
Here, too, breed many species of ducks, the mallard, gadwall, baldpate, three species of teal, shoveler, pintail, hooded mergansers, and Canada geese; other ducks and geese are migrants only.
Migrants enumerated in a certain centre of absorption will consequently grow less with the distance, proportionately to the native population which furnishes them.
The first group, which has been greatly increased by migrants from the second, since the establishment of the privileged Lebanon province (1861) under Christian auspices, lives apart from other peoples in semi-independence.
The process of absorption goes on as follows: The inhabitants of the country immediately surrounding a town of rapid growth flock into it; the gaps thus left in the rural population are filled up by migrants from more remote districts, until the attractive force of one of the rapidly-growing cities makes its influence felt, step by step, to the most remote corner of the land.
Amalitzky found in beds of Upper Permian age in the province of Vologda (Russia) (Map A, V.) species of Glossopteris and Naeggerathiopsis typical members of the Glossopteris flora, associated with species of the ferns Taeniopteris, Callipteris and Sphenopteris, a striking instance of a commingling in the far north of the northern hemisphere Permian species with migrants from " Gondwana Land."
Migrants proceeding long distances generally go by preference to one of the great cities of commerce or industry.