_ obtain the mean annual temperatures of important age. Pe 
204 J. Orton on the Andes and Amazons. 
was from Guayaquil to Para via Quito, Rio Napo and the 
Amazons, The chief value of these observations is derived — 
from the fact that they were made with instruments of preci- 
sion at many localities whose altitude was hitherto unknown, 
or obtained by an aneroid* or boiling apparatus, They also — 
test the utility of the thermo-barometer, experiments having — 
tures of boiling water are from Guyot’s tables after : 
revised by Moritz. These are placed along side of the baro- 
metric observations (reduced to 32°) in order to show To 
agreement between the barometer and boiling apparatus. the 
ground thermometer was sunk from two to three feet, 
lowed to remain about six hours. 2 Feu 
The first desideratum was the level of the Pacific off 
dor. After many careful calculations I fixed upon 299 
the barometric pressure at the freezing pomt. ¢ L kno 
sumes 30-000, and his altitudes are therefore too high. high. 
not Humbold¢’s base, but his estimates are uniform 
eee 
altitude 18 that & 
* “A Traveler who carries an aneroid alone with him must note the stat" 
within two or three hundred feet.”—Guyot. It is generally higher than 
dard in high temperatures. 
¢ See this Journal, vol. xix, p. 385. 
