We call them "waste places," but this is far from true. For the greater part they are quite as necessary as the places we call fertile. Of foodstuffs, for instance, the greater part of the Rocky Mountain highland produces not much more than the State of New York. Yet the presence of this great mountain wall diverts the moist warm air from the Gulf of Mexico northward, making the Mississippi basin one of the foremost granaries of the world. The absence of rain in the west slope of the Peruvian Andes makes much of the western part of Chile and Peru a desert. But that same absence of rain makes the nitrate beds possible; for had there been yearly rains, the nitrates long since would have been leached out. So, the lands the nitrates now fertilize are far greater in area than that of the region of the nitrates. Then, perhaps, we turn our eyes oceanward. What! wealth in these great wastes? Most certainly, and indispensable wealth at that. Let us forget for a moment that the oceans produce about as much meatstuffs as the land; this is really the least important feature about them. The oceans produce one thing that is absolutely necessary for every living thing almost every hour of the day, and that is fresh water. Every drop of fresh water that falls on the land is born of the ocean. Even the cold, polar oceans are indispensable to life, for their waters are constantly flowing out into the warmer oceans, thereby tempering the water of the latter and preventing it from being too warm for living things. Thus we see that, after all, Dame Nature is not very unkind to her subjects. Compensation is her great law; if her supplies are "short" in one direction they are "long" in another. And when we take the broader view we must conclude that there are no waste places. It is only when we take the extreme and narrow view that we voice the persiflage of the poet Pope: "While man exclaims: 'See all things for my use'-- 'See man for mine,' replies a pampered goose." Now, these waste places are of various kinds and in pretty nearly every locality. Some are deserts pure and simple; some are very dry and, to avoid hurting our national feelings, we politely refer to them as "arid regions"; some are so rugged and inaccessible that nothing short of dirigible balloons and aeroplanes could open a general communication with them; still others are in polar regions and too bleak and desolate to produce foodstuffs or support human life. The purpose of these chapters is to present the characteristics of these waste places. Most of them have been conquered by man, and their resources have been opened wide to the world. Possibly others yet remain to be conquered, but "what man has done, man can do." CHAPTER I THE WEALTH OF THE ARID SOUTHWEST