Geographically, then, and topographically it was no doubt in much the same state as the greater part of it remained up to the middle or end of the sixteenth century, a wild, tangled, roadless land, that is to say, shaggy with forests, abounding in streams, abounding, too, in lakes—­far more, doubtless, than at present, drainage and other causes having greatly reduced their number—­with rivers bearing the never-failing tribute of the skies to the sea, yet not so thoroughly as to hinder enormous districts from remaining in a swamped and saturated condition, given up to the bogs, which even at the present time are said to cover nearly one-sixth of its surface.

This superfluity of bogs seems always in earlier times to have been expeditiously set down by all historians and agriculturists as part of the general depravity of the Irish native, who had allowed his good lands,—­doubtless for his own mischievous pleasure—­to run to waste; bogs being then supposed to differ from other lands only so far as they were made “waste and barren by superfluous moisture.”  About the middle of last century it began to be perceived that this view of the matter was somewhat inadequate; the theory then prevailing being that bogs owed their origin not to water alone, but to the destruction of woods, whose remains are found imbedded in them—­a view which held good for another fifty or sixty years, until it was in its turn effectually disposed of by the report of the Bogs Commission in 1810, when it was proved once for all that it was to the growth of sphagnums and other peat-producing mosses they were in the main due—­a view which has never since been called in question.

A great deal, however, had happened to Ireland before the bogs began to grow on it at all.  It had—­to speak only of some of its later vicissitudes—­been twice at least united to England, and through it with what we now know as the continent of Europe, and twice severed from it again.  It had been exposed to a cold so intense as to bleach off all life from its surface, utterly depriving it of vegetation, and grinding the mountains down to that scraped bun-like outline which so many of them still retain; had covered the whole country, highlands and lowlands alike, with a dense overtoppling cap of snow, towering often thousands of feet above the present height of the mountains, from which “central silence” the glaciers crept sleepily down the ravines and valleys, eating their way steadily seaward, and leaving behind them moraines to mark their passage, leaving also longitudinal scratches, cut, as a diamond cuts glass, upon the rocks, as may be seen by any one who takes the trouble of looking for them; finally reaching the sea in a vast sloping plateau which pushed its course steadily onward until its further advance was overborne by the buoyancy of the salt water, the ends breaking off, as the Greenland glaciers do to-day, into huge floating icebergs, which butted against one another,