430 Miscellaneous Intelligenee. 
ort Vancouver was deduced from the corresponding observations 
during twenty-one days in July, together with those for the month 
horary oscillation at the summit is wn. 
a With regard to the mean temperature for that day, we have no 
positive data to determine it. We cannot take the observed tem- 
perature, as the observations were taken during the hottest part 
of the day. 
“By consulting the hourly observations of the thermometer at 
the camp, I find the range there is between 63° and 43°7°, or nearly 
20°, and supposing nearly as great a range of temperature on 
e app! 
imation we can have to the mean pressure for that day, as the 
unkno 
Pp 
summit, I have assumed the mean temperature there, for that day, » 
to be 34°. ; 
“The following are the final results of the computations : 
i Inter. alt. Alt. above e line. 
Stations. 
Sea level at mean low tide 
Astoria 
; cue 53 53 
Fort Vancouver .. ane, 79 132 
Camp on mountain slope.............-... 5,820 5,952 
Summit of Mt. Hood 5,273 11,225 
“The computations are made with new tables, which will shortly 
be published, and which ave results similar to those by Plante 
egnault’ 
very favorable circumstances of weat er, and the instruments used 
(new ones, by James Green, of New York) were brought down @ 
: , and compared with the standard at Fort Venu 
the discordance n his result and that 
y twee he 
4 party which ascended the mountain a vear earlier, and from red 
temperature, 180° F., at which they observed water to boil, 
i n remarks: an 
a is the instruments used were unreliable, 
___ this method of computing the altitude defective. With a boiling 
= point apparatus (or eter, as it is called), even of t 
| he cistern-barometer; but if the observations 4f@ 
s 
Sn ee Sr ne ee ee, 
Se ey = Sawer” at — 
oar or eee 
