556 Report on the Magnetic Survey. [No. 6. 



I left Nurigoon January 13th and went to Tezpore, and from 

 thence to Debrooghur in Upper Assam, where, besides, my own 

 observations, I obtained much valuable information, particularly 

 from Colonel Hannay, about geological subjects. 



From Debrooghur I descended the Brahmaputra and went by 

 Goalpara, Serajgunge, Koolna, and through the Sunderbunds to 

 Calcutta. 



After a stay of twenty-nine days I proceeded by Cawnpore, Agra 

 and Umballa to Simla, visiting Lucknow in Oude and Meerut for 

 magnetic observations. 



I arrived at Simla on the 24th. From hence Ladak, and the ranges 

 of this part of the Himalaya and the Kuenluen, will be examined. 



Two of the four Sikim men I had with me in Sikkim and Assam, 

 the Lepcha Chezy and the Bhootea Dublong, are to make some 

 observations during this summer in Sikkim, furnished with some 

 thermometers, a boiling thermometer, and a prismatic compass. 



Mr. Montairo, attached to my Establishment for collections, left 

 Darjiling August 23rd, and went to Calcutta, where he received, 

 and packed for transmission to Europe, the collections sent down 

 to him from the Khosia Hills and Assam. He arrived at Simla 

 May 20th. He is going vid Kangra to Kashmere. 



Magnetic Observations. 



Magnetic observations have been made at the following Stations : — 

 A — Assam and Delta of the Ganges. 



1. Oodulgoorie, on the Bhootan Frontier — December 30th and 

 31st, 1855, January 1st, 2nd, 3rd and 4th, 1856. Declination, hori- 

 zontal intensity, vertical intensity, and a set of observations for 

 ascertaining the daily variations, longitude and latitude. 



2. Nurigoon, in Bhootan — January 9th, 10th and 12th. Decli- 

 nation, horizontal and vertical intensity, longitude and latitude. 



3. Tezpore, on the right shore of the Brahmaputra — January 

 24th, 25th and 28th. Declination, horizontal and vertical force, 

 longitude and latitude. 



4. Debrooghur, Upper Assam — February 5th and 6th. Declina- 

 tion, horizontal and vertical intensity, longitude and latitude. 



Qowhatty—see preceding Eeport. 



