The entire journey through Arizona offers one of the most unique experiences of a lifetime. Is this "The Country God Forgot"? The vast stretch of the plains offer effects as infinite as the sea. The vista includes only land and sky. The cloud forms and the atmospheric effects are singularly beautiful. As one flies on into Arizona this wonderful color effect in the air becomes more vivid. Mountains appear here and there: the journey is up a high grade, and one realizes that he is entering the altitudes. A special feature of interest in Arizona is the town of Flagstaff, famous for the great Lowell Observatory, established there by Percival Lowell, a nephew of the noble John Lowell, who founded the Lowell Institute in Boston. Professor Percival Lowell is a man of broad and varied culture, a great traveller, who has familiarized himself with most things worth seeing in this sublunary sphere, and has only failed to explore Mars from reasons quite beyond his own control. At his own expense he has founded here an Observatory, with a telescope of great power, by means of which he is making astronomical researches of the greatest value to science. The special advantage of Arizona in astronomical study is not the altitude, but in the fact that there is the least possible vibration in the air here. Mr. Lowell's work makes Flagstaff a scientific centre of cosmopolitan importance, and scholars and great scientists from all over the world are constantly arriving in the little Arizona mountain town to visit the Observatory. Flagstaff has no little archaeological interest, also; the famous cliff dwellings of the Zuni tribe, which Frank Cushing explored and studied so deeply, are within a few miles of the town, located on the summit and sides of an extinct volcano. They now present the appearance of black holes, a few yards deep, often surrounded with loose and broken stone walls, and broken pottery abounds all over the vicinity. The most remarkable group of the cliff dwellers is to be seen in Walnut Canyon, eight miles from Flagstaff. This is one of the deep gorges, the cliffs rising several hundred feet above the valley; and they are sheer terraced walls of limestone, running for over three miles. In these terraces, in the most singularly inaccessible places, are dozens of the cliff dwellings. Some of them are divided into compartments by means of cemented walls, and they retain traces of quite a degree of civilization.