Here we see how potent has been the effect of the introduction of a single tree, nothing whatever else having been done, with the exception that the land had been enclosed so that cattle could not enter. But how important an enclosure is, I plainly saw in Farnham, in Surrey. Here there are extensive heaths, with a few clumps of old Scotch firs on the distant hill tops: within the last ten years large spaces have been enclosed, and self-sown first are now springing up in multitudes, so close together that all cannot live.
– Charles R. Darwin, Origin of Species, p.123
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