1856.] Report on the Magnetic Survey. 7 



of Cherra, as well as the slates of Myrung, showing no trace of 

 magnetism, even when pieces were brought nearly in contact with 

 the dip needle, as well as with the horizontal magnet in the deflec- 

 tion apparatus. 



At Gowhatty the declination was found to be 1° 41' E. 



The horizontal intensity of magnetism was found decidedly to 

 decrease with the height, as resulting particularly from the observa- 

 tions on the little Eungeet, and at the summit of Phulloot, with a 

 difference of level exceeding 10,000 feet. Before giving the amount of 

 decrease in numbers, I wish to compare with my own the correspond- 

 ing observations made by my brothers in the Western Himalayas. 



The results of the determination of the dip also tend to show a 

 decrease of the vertical force of magnetism. 



I had at 



Darjiling, April 19th, 36° 28-985. 



July 30th, 36° 31-160. 



Tonglo 10,000 ft. May 12th, 36° 22-04. 



Phulloot, [the difference in latitude making the dip greater.] 



June 9th, 36° 46-875. 



At the other stations the dip was the following : — 



BeriadaD gee, Aug. 17th, 35° 11-595. 



Eampore Bauleah, August 28th, 30° 57*75. 



Cherra, October 23rd, 33° 34*26. 



Gowhatty, December 10th, 35° 18-73. 



Together with the magnetic observations, the meteorological ele- 

 ments, pressure, temperature, and moisture of the atmosphere, 

 and the direction of the wind, were minutely observed and deter- 

 minations of latitude and longitude combined. 



III. — Meteoro logy. 



A set of meteorological observations embracing the temperature 

 of the air, the moisture, the pressure of the atmosphere, direction of 

 the wind, and the temperature of the ground at different depths, had 

 been made with great regularity in every place we passed through or 

 where we made a stay. 



I add to this report the hourly means of a set of observations 



