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In Xanadu did Kubla Khan A stately pleasure-dome decree, Where Alph, the sacred river, ran Through caverns measureless to man Down to a sunless sea.

Some other correlations are apparently due to the manner in which natural selection can alone act. For instance, Alph.

Being familiar with the fact that many species, naturalised through man's agency, have spread with astonishing rapidity over new countries, we are apt to infer that most species would thus spread; but we should remember that the forms which become naturalised in new countries are not generally closely allied to the aboriginal inhabitants, but are very distinct species, belonging in a large proportion of cases, as shown by Alph. de Candolle, to distinct genera.

It is this fable of the underground course of Alpheus that Coleridge alludes to in his poem of "Kubla Khan": "In Xanadu did Kubla Khan A stately pleasure-dome decree, Where Alph, the sacred river, ran Through caverns measureless to man, Down to a sunless sea."

We see the same fact in ascending mountains, and sometimes it is quite remarkable how abruptly, as Alph. De Candolle has observed, a common alpine species disappears. The same fact has been noticed by Forbes in sounding the depths of the sea with the dredge.

In the vestry is the famous horn of Alphus. It was given by Alph, or Alphus, son of Thorald, a little while before the Conquest. Alphus laid it on the altar of the minster, as a sign that he gave certain lands to the church. The horn is made out of an elephant's tusk. The wide end of the horn is ornamented with carvings of griffin dogs, a unicorn, and a lion eating a doe.

It is a remarkable fact, strongly insisted on by Hooker in regard to America, and by Alph. de Candolle in regard to Australia, that many more identical or slightly modified species have migrated from the north to the south, than in a reversed direction. We see, however, a few southern forms on the mountains of Borneo and Abyssinia.

The species of all kinds which inhabit oceanic islands are few in number compared with those on equal continental areas: Alph. de Candolle admits this for plants, and Wollaston for insects.

It might, also, perhaps have been expected that naturalised plants would have belonged to a few groups more especially adapted to certain stations in their new homes. But the case is very different; and Alph.

This is the exit of the Lesse, which, higher up the vale, at the curious Perte de Lesse, swerves suddenly from its obvious course, down the bright and cheerful valley, to plunge noisily through a narrow slit in the rock "Where Alph, the sacred river, ran Through caverns measureless to man Down to a sunless sea."