the volcanic hills, the dark color of the ground affords very appreciable relief.
The general Laboratory is furnished with individual tables, a general work table and two sources of water supply. It should be noted that, although two miles from town and upon an elevation of 300 feet above it. there is abundant water supply. It is to the enlightened interest of the citizens of Tucson that this convenience, as well as the electrical connections, acreage and roadways, are to be credited. The immediate source of water is a 300-gallon tank, supplied from a pumping station at the foot of Sentinel Hill, which stands immediately to the southeast of the laboratory.
Adjoining the general laboratory is the stock room, liberally supplied with the necessities for work. This leads into a photographic dark room, with water supply, ventilation and a cement floor, and which may be used as a physiological dark room, with constant temperature.
The library, which adjoins the stock room, though at present small, contains a carefully selected lot of periodicals and books, the latter chosen with special reference to their bearing upon desert exploration and vegetation. From the library one enters the office of the resident officer, Dr. W. A. Cannon, whose generous treatment and constant sympathy, coupled with the material opportunities afforded, leave little to be desired.
The view commanded from the laboratory site is a panorama of
