EFFECTS OF FIRING THE PRAIRIES.—We presume there must be some mistake that any of the tribes residing on the plains set them on fire to facilitate the purposes of hunting. It has the contrary effect, driving the game out of their own country into that of their neighbors. Buffalo may pass through a burnt country covered with snow, but can not remain, and travel until they meet with suitable grazing. Consequently the greatest precautions are used by both Indians and whites to prevent their taking fire in the fall, when the grass is dry (the only time it will burn), and the most severe penalties short of death are imposed on any person, either white or red, who even by accident sets the prairie on fire. A good thrashing with bows and sometimes tomahawking is in store for the poor traveler who has been so forgetful as not to put out his camp fires and they extend to the plains. These fires are made mostly by returning war parties, either with the view of driving the buffalo out of their enemy’s country or as signals to their own people of success in their expedition, though sometimes they originate in accident or petty malice of individuals. With regard to its injuring the soil it has no such effects; on the contrary, the next crop of grass is more beautiful than the other, as the undergrowth and briars are by that means destroyed. The same, unfortunately, is not the case with the timber. There are no forests on the plains to burn, though where the fire passes through the bottoms of the Missouri it consumes and kills great quantities of timber, which dries and decays and is only replaced in time by younger saplings. Fruit bushes are also destroyed, though they recover its effects in three or four years. WASTE LANDS.—In this section there are no deserts or barren land of any extent; though there are some marshes, pools, and swamps which, however, are not so close together or extensive as to form any formidable obstruction to roads. Even if they could not be drained or otherwise disposed of, they could be left on either side of the way. Neither do these appear to affect the health of any of the Indians more than being the cause of producing hosts of mosquitoes, which are very annoying to man and beast. EFFECTS OF VOLCANIC ACTION.—We are not aware of any remarkable appearances of this kind,[4] neither are there to be found extensive sand plains or other tracts entirely destitute of herbage. The cactus is found everywhere, but not in such quantity as to destroy herbage or be a hindrance to animals traveling. A mile or two may occasionally be found where herbage is comparatively scarce. Still, even in these places there is sufficient for animals for a short time. [4] There are portions of pumice stone and other things occasionally picked up that have undergone volcanic action; also burning hills, but no eruptions.