532 Note on the Construction of the Map of the [Nov. 



*Note on the Construction of the Map of the British Himalayan Fron- 

 tier in Kumaon and Garhwal, by Lieut. H. Strachey. 



My map is based on the Indian Atlas, Nos. 65 and 66 ; the cis- 

 Himalayan parts of which, being the result of Mathematical Survey, 

 I have copied exactly, with the following alterations and additions : 



1. Some alteration made about the extreme north-eastern Kali in 

 Byans, the original being decidedly wrong. 



2. Other occasional defects in the positions of small streams, villages, 

 &c. here and there amended, from observation or information. 



3. Glaciers inserted in many places : these for the most part show 

 the general position merely as derived from information or distant view ; 

 approximation to the true size or figure being attempted only in the 

 Gori Glacier above Milam in Jwar, from personal inspection. 



4. Entry from information, of sundry inter-Himalayan passes between 

 the several Alpine valleys of Kumaon : there are doubtless many more 

 of these remaining to be mapped in northern Garhwal. 



5. All elevations of places to be found in Capt. Webb's book, reduced 

 to sea level by the addition of 87 feet for the (supposed) height of his 

 Calcutta comparisons above the sea ; and the mean of all measurements 

 given where more than one is recorded for any place. I have also got 

 elevations of one or two places on the Alpine and sub-Alpine Kali (nei- 

 ther in Webb's book, nor in the map), from Vol. XII. Asiatic Re- 

 searches, adding 72 feet for correction of the starting point from which 

 they were derived trigonometrically in Webb's survey. 



6. In south-eastern Jwar, I have marked in the map the Ralam 

 valley, with the Pass from upper Jwar, Barjiganw-Dhura : the village of 

 Ralam, and the river down to its confluence with the Gori at the 

 entrance of Munshari : in northern Jwar details have been given of the 

 intricate passes into Tibet. 



The last mentioned additions to the maps of the " Indian Atlas" are 

 mostly from my own observations, in June, 1846, which, though 

 unaided by surveying instruments of any sort, will give an idea of the 



* This map, a part of which only has been reduced to illustrate Lieut. Stra- 

 chey's Journal, will be published hereafter, but it seems desirable that these re- 

 marks en its construction should be printed with Lieut. Strachey's other papers. 

 —Eds. 



