1833.] kept at Kotgarh, Subatha, &c. 619 
With exception of the month of April, so inviting to a resident in the 
hills tor expeditions into the higher and more remote parts of the vast 
Himalayan range, we find in the foregoing abstract, besides three months 
at Subathi, a nearly complete annual series of barometrical observations 
for Kotgarh, a station more than 6000 feet elevated above the sea*, and 
far enough within the first range of hills to obviate the effects of the cur- 
rents of air from the plains,as observed in the Dehra Dain by Dr. Royuet. 
It must not be expected that the regularity observed onthe level continent 
of India will be found in the march of the barometer in a mountainous coun~ 
try, where fluctuations of temperature, moisture, and wind are much more 
frequent and sudden than in the plains ; still the same general curve ob- 
tains through the year, and the diurnal rise and fall is regular and of the 
same nature as in the plains, not a negative oscillation as is observed at 
great elevations on the Alps. The average diurnal oscillation or fall from 
10 a. M. to4 Pp. m. is 0.063 inch : to which adding one-fourth (or, as 30 
in. to 23 in.) to render it comparable with the oscillation under a pres- 
sure of 30 inches, we have .079, which is only two-thirds of the daily 
oscillation at Seharanpurt, as deduced from Dr. Royue’s registers ; we 
may therefore conclude that at a greater elevation, we should observe 
a still further decrease until, passing zero, the diurnal oscillation would 
become negative; that is, the barometer would rise from 10 a. m. to 
4 p. m.as observed at the convent of St. Brrnarp’s. The solution of this 
curious question and the determination of the zero or no oscillation alti- 
tude, may probably be obtainable from the journals of Captain Gzrarp 
or his brother, Dr. J. G. Gerarp, who is known to have reached an alti- 
tude of 17000 feet, barometer in hand ; and we may confidently trust to 
their joint exertions in elucidation of it : for one fact of this nature esta- 
bished on certain data will better repay their labours in the course of 
meteorology than even a lengthened series of ordinary observations, 
The thermometrical range out of doors is incomplete, the minimum 
only being registered: there cannot however be a wide difference be- 
tween the monthly mean, in-doors, and in the open air. The monthly va- 
riations deduced from the latter column, (the monthly mean’s) or from 
the column of exterior minima, give nearly the same annual curvature. 
The following table (column a) takes it from the interior mean. April 
and October are the two average months for temperature as well as for 
pressure, but the months of January and February present an anomaly 
in the barometer being lower than usual for those months in both the 
years under review. 
* 6915 feet, by Capt. Hersert, As. Res. xiv. 336 ; 6600 by subsequent correc- 
tion, vol. xv. 413. 
+ See his note on the hour of maximum temperature in the hills, Jour. As. 
Soc. vol. i. p. 97. 
t Journal, i. 30. 
342 
