xvi INTRODUCTION. 
Webb, are 22,799; 22,707; and 22,385. One of these, as observed by Mr. Colebrooke, 
is no doubt the mountain which was observed by Colonel Colebrooke from his stations, 
Pilibhit and Jethpur; and the mean of his observations, calculated with an allowance of 
=}; of the intercepted arc for terrestrial refraction, gave 22,768. 
The loftiest of the second group (No. xiv.), commonly called the Juwahir Peak, was 
seen by Captain Webb from Casipore: it is also distinctly visible from Saharunpore, and 
had its position, as well as a fewothers, determined by, and afforded unexceptionable means 
of joining the two surveys. Captain Webb gives 25,741 as its height, the observed 
height of Casipore being 757 feet.* In Colonel Hodgson’s survey, 25,749 feet is given 
as the height of the same peak; that-of Saharunpore having been ascertained to be 
1,000 feet above the level of the sea. 
To the S.E. of this survey there is a considerable tract of unexplored mountainous» 
country, before we come to Cathmandoo, where Colonel Crawford, in 1802, by careful 
observation, ascertained the distances of several selected points from various stations in 
Nepal, of which the relative situations were ascertained by a trigonometrical survey, 
proceeding from a base of 852% feet, carefully measured four times, and verified by 
another base of 1,582 feet, measured twice. The positions of the same mountains were 
also settled by observations made in the plains of Behar. The mountain, called 
Dhaibun, distant 35$g. ms. seen under an angle of 5° 4’ 21”, was found to be 
elevated 20,140 above the station from which the angle was taken, and which is itself 
more than 4,500 feet above the level of the sea; another exceeds the elevation of the 
same station by 17,819; another by 20,005; another by 18,662. The height of Gos- 
sainthan is marked 24,740 feet in Dr. Wallich’s Map. All these are visible from Patna, 
the nearest being nearly 170 English miles distant, and the furthest about 226 miles. 
Still further to the eastward, the continuation of the Himalayan range, which bounds 
Assim on the northward, still presents a long line of snowy peaks. Some in 28° of 
N. latitude, and between 924° and 93° of E. long. are mentioned in Lieutenant Wilcox’s 
Map, as varying in height from 20,720 to 21,600 feet; and the Himalayas are continued 
to beyond 98° of E. longitude. | | 
Though extensive tracts of the Sicendans 3 remain unexplored, the uniform result of 
every observation, and many of them within twenty miles, establishes the great elevation 
of the Himalayan chain; so that, Captain Herbert, speaking only of the surveyed 
portion 
* For the corrected heights here given of Casipore, and of the snowy peaks included in the Kemaon survey, 
which however correspond with those given in the large 4-inches to a mile-map, which has been published of 
this survey, I am indebted to the kindness of Captain Webb, who originally estimated the height of Casipore 
above the level of the sea, before any observations had been made, at 650 feet ; but subsequently found this 
estimate to be too low. The mean of a month’s observation, in Feb. 1818, with excellent barometers, gave 748 
feet, and the mean of nearly another month in January and February 1819, gave 766 feet, as the difference 
of height between Casipore and Mr. Colvin’s barometer in Calcutta; the mean 757 feet has been taken at the 
height of Casipore, and as this exceeds the first estimate by 72 feet, this number requires to be added to all the 
elevations geometrically deduced, which were published in the 13th vol. of the “ Researches of the Asiatic 
Society.” Some addition still requires to be made for the height of Calcutta above the level of the sea. 
