OCT. — mar. 1858-59.] Progress of the Magnetic Survey. 333 



During a stay of six days at Jubbulpore, I was engaged with a 

 series of barometrical and meteorological observations, and with 

 some chemical experiments on the composition of the atmosphere, 

 which were afterwards repeated on the Umerkuntuk Hills. 



I started from Jubbulpore on the 6th of January, and went by 

 Mundlah, Ramgurh, Goruckpore and Karenchia up to Umerkun- 

 tuk, which forms a very important part of the water-shed of Cen- 

 tral India. Near it are the sources of the Soane and Tohilla, of 

 the Nerbudda, and of the Yrap, an affluent of the Mahanuddy. 



I arrived at Umerkuntuk on the 20th of January 1856, and hav- 

 ing set up my meteorological instruments, which were regularly 

 registered during my stay, I made excursions to the sources of the 

 Tohilla and Soane, and up to the summit of Rajmeergurh Hill, 

 which is one of the highest points of the Mekul range, East of 

 Umerkuntuk. 



The plateau of Umerkuntuk afforded me a favorable opportuni- 

 ty of making physical and meteorological experiments, and though 

 the absolute elevation is not very considerable (3,290 to 3,330 Eng- 

 lish feet,) the data obtained for the decrease of the temperature 

 of the air, and of the ground, &c, may not prove without some in- 

 terest for the physical geography of Central India, when compared 

 with similar data obtained in the Himalayas, the Neilgherries, and 

 Cossyah Hills, &c. 



I left Umerkuntuk on the 26th J anuary, and proceeded via Pain- 

 dra, Moonda, and Amukpore to Sohagpore ; thence in a Northerly 

 direction, through Kanrodi and Ramnuggur, crossing the Soane 

 River twice, to Rewah, where I arrived on the 11th of February. 



By Mungown and Sohagi, I went to Allahabad, and thence along 

 the Grand Trunk Road to Agra, where I arrived on the 21st of Fe- 

 bruary. 



At Agra the whole of the collections sent down last year from 

 the Himalayas, and those made during this cold season, were care- 

 fully re-packed for the purpose of being sent to England. 



I left Agra on the 8th of March, and travelled via Delhi to Sa- 

 harunpore, and thence to Nahun, where I was engaged, for several 

 Vol. xx. o. s. Vol. v. n. s. 



