id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
chapter_012		chapter_012			.txt	text/plain	8807	212	43	This relation between the power and extent of migration of a species, either at the present time or at some former period under different physical conditions, and the existence at remote points of the world of other species allied to it, is shown in another and more general way. I have carefully searched the oldest voyages, but have not finished my search; as yet I have not found a single {394} instance, free from doubt, of a terrestrial mammal (excluding domesticated animals kept by the natives) inhabiting an island situated above 300 miles from a continent or great continental island; and many islands situated at a much less distance are equally barren.	cache/chapter_012.txt	txt/chapter_012.txt
