1856.] Report of the Magnetic Survey of India. Ill 



good order in Mussoorie. In two others, some air introduced itself; 

 they will however, be easily boiled and put again in perfect order, 

 in Lieut .-Colonel Waugh's office at Dehra. Two small Mountain Ba- 

 rometers, by Newman, with which Captain Thuillier kindly supplied 

 us at Calcutta, were of great use to us whilst going up along the Gan- 

 ges to ISFynee Tal, enabling us constantly to make comparative observa- 

 tions with the help of our assistants, but we found that their con- 

 struction was not well adapted for travelling in the Himalayas, 

 where a considerable quantity of air soon introduced itself into 

 the tubes. 



3rd. "We have determined the elevations above the sea of from 

 350 to 400 places, and have endeavoured as much as possible to 

 obtain for each place not only one, but several readings of the 

 instruments at different hours. At some stations like Nynee Tal, 

 Chineir Peak, Laria, Kanta, Milum, Tanti Pass, the Sutlej near 

 Gyungal, Mangnang, Mana, Kedar .Kanta and Mussoorie, we have 

 obtained a regular series of Barometric observations during several 

 days or several weeks, we ourselves or our assistants reading the 

 instruments hourly, or at intervals of two hours. 



"We may be excused for not subjoining to this Eeport any larger 

 list of heights, since it would take a very considerable time to make 

 the necessary calculations with all the accuracy and the detail which 

 is required for exact and final results, and the great distances over 

 which we shall have to go to complete the observations made last 

 year, make it impossible for us to stop a long time in one place. In 

 reference to the heights quoted in this report, we wish to state that 

 they have been calculated from corresponding observations made at 

 Agra and at Bareilly. The observations at Agra were made with 

 great care in the Office of W. Muir, Esquire, Secretary to the 

 Government of N. W. P., for those at Bareilly we are indebted to 

 the scientific zeal of Dr. Payne. Mr. Muir obligingly transmitted 

 to us regularly the monthly registers. 



The heights thus deduced must not be considered as quite final 

 results, since at a later period, when we have an opportunity of 

 calculating the whole of our heights from several corresponding 

 stations, and introduce certain corrections in reference to the exact 

 mean temperature of the air between the higher and the lower 



