APPENDIX. 



The barometrical observations of the accompanying table vi^ere in every case, not par- 

 ticularised, derived from a mean of several during the day, and sometinles as at Sugar, 

 Tendukaira, and Jebelpur, from a mean of several days ; the mercury of the barometer 

 was taken out, the tube cleaned, and fresh mercury purified by Mr. Prinsep, of Benares, 

 substituted at that place ; after which it was compared with his barometer, and as a check 

 upon it, I used a box barometer of Sir H. Englefield. 



It was constantly hung up in my tent, and the detached thermometer suspended in 

 the shade in the open air, and I always waited, until the attached thermometer agreed with 

 that which was detached, or in other words, until the quicksilver of the barometer had 

 acquired the temperature of the air ; so that one thermometer was sufficient to register. 



My method of calculation is that of Dr. Hutton, checked, indeed, by that of Dr. Ro- 

 binson, but never altered, because the results were nearly equal, and m}' point of reference 

 and comparison was a station of the grand trigonometrical survey at Sdgar, which is 2195 

 feet above the level of the sea. 



I ascertained by measuring a base line, that this station was 250 feet higher than the 

 tent where my barometer was placed, and a mean of fourteen observations gave 1933 feet 

 for its elevation above the sea according to Dr. Hutton's method, 19334-250=2183, dif- 

 fering only twelve feet from the geometrical result ; and as I have used the same barometer 

 and the same mode of calculation throughout — if twelve feet be added to each of the items 

 of the table, they will, I conclude, be nearer the truth, because I have greater confidence in 

 the geometrical results, than in those of the barometer. 



The 



i 



