292 ~=— B. Silliman on the Mining Districts of Arizona. 
The barometer peg at Fort Mojave was noted in my 
journal as 29°55 to 29:75. At Allen’s Camp, San Francisco 
District, it was 98) 193, average of rts a observations between 
J uly 26th and Aug. Ist, the greatest difference being ‘050. 
Lhe highest temperature noted in the sun was 120°F., at San 
Juan Camp, (bar, 27°65), Aug. 6. In the sand the mercury rose 
to 136°, and eggs are coagulated by burying in the sands in 20 
or 30 minutes exposure. 
The wet-bulb thermometer, which was observed thrice a 
during our journey out an nd back, indicated all through the 
jave Desert and the Colorado regions a remarkable dryness of 
the air. A few examples will serve as illustrations. 
July 21, Mojave Desert, 2 P.M., air 104°, wet-bulb 66, dif. 38° 
ae. se 6 “ 104 “ WO OM Be 
“ 26, Fort Mojave, . * 108 ee. ee 
“ 28, ‘Allen’s Camp, “1015 “ 70 31h 
Aug. 1, 10 miles south of Fort Mojave, “ 109 ee ee... 
Even at meer ae difference was very remarkable, sometimes 
as much as 20°, 
Aug. 13, Forks of Mormon Eee 94 P.M., air 82°, wet- bulb ll dif. 22° 
. 14, Cottonwood, 9 P. eca@ 17 
The 2 P.M. Sees rarely gave less than ‘si ae 
between the wet- and dry -bulb thermometers 
° Hot wind storms, or sirrocos, are not unfrequent in the desert 
and on the Colorado, _I find this mention a pee of these 
storms on the desert in my notes of the journey. 4 ome af 
ic ey wintitk us hot as the wind froin a fern. bearing 
along with it a na and almost stifling aoe of sand, pal 
ing: the akin like h ail. Th vain did we seek to shut it out by 
a eat des Pane thane co ald not be 
a then only site: ik sim ple a ae 
ee restore ce good health, 3 a are ay be glad if this fact were Mm? and 
ly | ene ; se in eastern cities. 
Pees : from this 
- “Tam now rete: repoe two years and have ne had a death among | ihe 
% 
eos 
See ae ee 
