. The vegetation of a desert mountain range as conditioned by climatic factors. Desert plants. 50 VEGETATION OF A DESEBT MOUNTAIN RANGE. it fell to per cent. Neither does the percentage of summer rain fluctuate in relation to the occurrence of very wet or very dry years. In 8 of the wettest years since 1876 (14 inches or above) the summer rain was per cent of the total, and in 11 of the driest years (9 inches or less) the summer yielded per cent of the total (see table 2). The impossibility of securing figures for the winter precipitation in the Santa Catalina Mountains makes it
. The vegetation of a desert mountain range as conditioned by climatic factors. Desert plants. 50 VEGETATION OF A DESEBT MOUNTAIN RANGE. it fell to per cent. Neither does the percentage of summer rain fluctuate in relation to the occurrence of very wet or very dry years. In 8 of the wettest years since 1876 (14 inches or above) the summer rain was per cent of the total, and in 11 of the driest years (9 inches or less) the summer yielded per cent of the total (see table 2). The impossibility of securing figures for the winter precipitation in the Santa Catalina Mountains makes it necessary to estimate the annual totals of rainfall at different altitudes from the known figures. LOS RIVER- INDIO. YUMA. GILA ANGELE5. SIOE. BEND. MAR1- CASA BOWIE. LORDS- DEWING. MESLLA COPA. GRANDE. BURG. PARK. Fig. 3.—Graphs showing percentage of winter rainfall to annual total (light line), and of summer rainfall to annual total (heavy line), for a chain of 13 stations from the Pacific to the Rio Grande. for the summer rain. The average rainfall at the stations at 7,600 feet and 8,000 feet for the years 1907 to 1914 is inches (443 mm.), from which it may be assumed that the annual average is approximately 35 inches (889 mm.). The summer rain at Tucson during 1907 to 1914 was per cent of the annual total. If the seasonal distribution of rain is the same on the mountain that it is at Tucson, the above esti- mate of the annual total for the mountain is correct within 1 or 2 inches. The influence of altitude on the seasonal distribution of rainfall in Arizona is a matter which can not be determined without further data. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Shreve, Forrest, 1878-1950. Washington, D. C. , Carnegie Institution of Washington
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