id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
22764	Darwin, Charles	On the Origin of Species by Means of Natural Selection or the Preservation of Favoured Races in the Struggle for Life. (2nd edition)			.txt	text/plain	158252	5639	56	single species--On Extinction--On simultaneous changes in the forms of life Varieties from one or more Species--Domestic Pigeons, their Differences individuals of any one species or variety in a state of nature. and plants, and compare them with closely allied species, we generally closely allied natural species--for instance, of the many foxes--inhabiting to the many species of finches, or other large groups of birds, in nature. Variability--Individual differences--Doubtful species--Wide ranging, Variability--Individual differences--Doubtful species--Wide ranging, natural selection cannot do, is to modify the structure of one species, new species in the course of time are formed through natural selection, species, which are already extremely different in character, will generally case in nature; species (A) being more nearly related to B, C, and D, than selection, the extreme amount of difference in character between species large groups of species, has _differed_ considerably in closely-allied So with natural species, if we look to forms very distinct, for instance to	./cache/22764.txt	./txt/22764.txt