Similar tales might be related, of the great difficulties and hardships bravely overcome by several other foreign groups in Wisconsin: for instance, the Poles, the Dutch, the Welsh, the Bohemians, the Cornishmen of the lead-mine region, and the Icelandic fishermen of lonely Washington Island. But the foregoing will suffice to show of what sturdy stuff our foreign-born peoples are made, and cause us to rejoice that such material has gone into the upbuilding of our commonwealth. SWEPT BY FIRE Before the great inrush of agricultural settlers, in 1836, most of the surface of Wisconsin was covered with dense forests. In the northern portion of the State, pines, hemlocks, and spruce predominated, mingled with large areas of hard wood; elsewhere, hard wood chiefly prevailed, the forests in the southern and eastern portions being frequently broken by large prairies and by small treeless "openings." In the great northern pine woods, lumbermen have been busy for many years. They leave in their wake great wastes of land, some of it covered with dead branches from the trees that have been felled and trimmed; some so sterile that the sun, now allowed to enter, in a rainless summer bakes the earth and dries the spongy swamps; while all about are great masses of dead stumps, blasted trunks, and other forest débris. Settlers soon pour in, purchase the best of this cut-over land, and clear the ground for farms. But there are still left in Wisconsin great stretches of deforested country, as yet unsettled; some of these areas are worthless except for growing new forests, an enterprise which, some day, the State government will undertake for the benefit of the commonwealth. Now and then, in dry seasons, great fires start upon these "pine barrens," or "slashings," as they are called, and spread until often they cause great loss to life and property. These conflagrations originate in many ways, chiefly from the carelessness of hunters or Indians, in their camps, or from sparks from locomotives, or bonfires built by farmers for the destruction of rubbish. Nearly every summer and autumn these forest fires occur more or less frequently in northern Wisconsin, working much damage in their neighborhoods; but usually they exhaust themselves when they reach a swamp, a river, or cleared fields. When, however, there has been an exceptionally long period of drought, everything in the cut-over lands becomes excessively dry; the light, thin soil, filled with dead roots and encumbered by branches and stumps, becomes as inflammable as tinder; the dried-up marshes generate explosive gases.