Physical characteristics of the arid region.--The land-system needed for the arid region.--The rainfall of the western portion of the United States [based upon the "Smithsonian tables of precipitation in rain and snow"]--Water supply, by G.K. Gilbert.--Certain important questions relating to irrigable lands.--The lands of Utah.--Irrigable lands of the Salt Lake drainage system, by G.K. Gilbert.--Irrigable lands of the valley of the Sevier river, by Capt. C.E. Dutton.--Irrigable lands of that portion of Utah drained by the Colorado River and its tributaries, by Prof. A.H. Thompson.--Land grants in aid of internal improvements, by Willis Drummond, Jr
