J. Orton on the Andes and Amazons. 211 
Comparison of mercurial barometer with boiling apparatus. 
—After numerous observations taken with these instruments 
side by side from the sea-level to the top of Pichincha, I con- 
clude that the boiling apparatus, though very convenient, can 
not be depended upon and is the least reliable in high altitudes. 
In the Amazonian valley it is certainly useless. The accuracy 
of Regnault’s Tables of corresponding pressures was tested on 
the Andes by Visse in 1848, and he found the agreement very 
satisfactory. But my experiments on the same ground do not 
confirm this. At Guayaquil he found a difference of 0092 in.; 
I found ‘008. At Quito his difference was 015 ; mine 045. On 
Pichincha, his difference was (0045; mine, taken at the same 
hour of the day, was ‘008, At Papallacta, the boiling point 
indicated a pressure 205 too small, and at Archidona a pres- 
sure 364 too great. On Mont Blanc, Saussure found the ba- 
rometer 17-136, and the pressure indicated by boiling water, 
17883. At Rochester, they differ by -130. 
Mean annual temperature, 
santa Rosa, 79°. 
P 8, * (Castelnau, 79°°7) 
Tabatinga, 82°: “ 79°°34 
Pard, 80°-2 (Dewey, 80°°5) 
The isothermal line in the United States corresponding to 
m . 
© 9. The mean temperature at Fort Massachusetts on the 
Rocky Mountain plateau (alt. 8400 ft.) is 41°-1. The tempe- 
tature of Quito is just 1° less than that of Rome; but the 
“Pung months at the two cities have the same mean tempera- 
ture, he mean temperatures of Antisana Hacienda and 
Quebec are the same, but the seasons are nearly reversed. 
; Spring. 8 er, Autumn. Winter. Year. 
fuebec, 38°00 6T°"6T. = BGT «=—«13°33 40°67 
“ntisana, 429-16 38°-26 40°-70 419-80 40°°70 
The coldest hour at Quito is 6 a. m.; the warmest between 2 
ty 3 P.M. The latter corresponds with that on the east 
asts of the United States and Asia; on the west coast of 
paerica and Europe it is 1 or 14 P.M. The greatest heat at 
ara occurs at 2 p. M, ; the hottest month is November and the 
