THE CLIMATE OF THE PACIFIC SLOPE SOMETHING ABOUT IRRIGATION THE LOCATION OF THE CITIES OF THE PACIFIC SLOPE THE FOREST BELT OF THE SIERRA NEVADA MOUNTAINS THE NATIONAL PARKS AND FOREST RESERVES THE WESTERN UNITED STATES THE WORK OF THE COLORADO RIVER The Colorado River is not old, as we estimate the age of rivers. It was born when the Rocky Mountains were first uplifted to the sky, when their lofty peaks, collecting the moisture of the storms, sent streams dashing down to the plains below. Upon the western slope of the mountains a number of these streams united in one great river, which wound here and there, seeking the easiest route across the plateau to the Gulf of California. At first the banks of the river were low, and its course was easily turned one way or another. From the base of the mountains to the level of the ocean there is a fall of more than a mile, so that the river ran swiftly and was not long in making for itself a definite channel. Many thousands of years passed. America was discovered. The Spaniards conquered Mexico and sent expeditions northward in search of the cities of Cibola, where it was said that gold and silver were abundant. One of these parties is reported to have reached a mighty canon, into which it was impossible to descend. The canon was so deep that rocks standing in the bottom, which were in reality higher than the Seville cathedral, appeared no taller than a man. Another party discovered the mouth of the river and called it, because of their safe arrival, The River of Our Lady of Safe Conduct. They went as far up the river as its shallow waters would permit, but failed to find the seven cities of which they were in search, and turned about and went back to Mexico. For years afterward the river remained undisturbed, so far as white men were concerned. A great part of the stream was unknown even to the Indians, for the barren plateaus upon either side offered no inducements to approach. Trappers and explorers in the Rocky Mountains reached the head waters of the river nearly one hundred years ago, and followed the converging branches down as far as they dared toward the dark and forbidding canons. It was believed that no boat could pass through the canons, and that once launched upon those turbid waters, the adventurer would never be able to return. The Colorado remained a river of mystery for nearly three centuries after its discovery. When California and New Mexico had become a part of the Union, about the middle of the last century, the canon of the Colorado was approached at various points by government exploring parties, which brought back more definite reports concerning the rugged gorge through which the river flows.