102 Report on the Progress of the Magnetic Survey. [No. 2. 



pore, which are so remarkable for their excessive sum- 

 mer heat, is very high, when compared with the 

 stations in the more elevated districts of the Nerbudda 

 and of Bundelkund. 

 Chandra, South-East of Nagpore, 14th to 16th January, 29 

 Eajahmundry, at the head of the Godavery Delta, 2nd to 



8th February, 29 8 



Cocanada, East of Eajahmundry, on the sea-coast, 29 6 



The observations were made in three quite different locali- 

 ties, which gave 29° 5' C, 29° 7' C, and 29° 6' C. 

 The temperature of the ground is a little colder than 

 at Eajahmundry, though Cocanada is 40 E. E. lower 

 than the other place, on account of the great humidity 

 of the sandy deposits in the lower parts of the Goda- 

 very Delta. 



Trichinopoly, South of Madras, March 7th to 8th, 29 9 



Ootacamund, on the Neilgherry Hills, March 12th to 17th, 18 8 



A fine spring near the Ootacamund Church was, 18 



Madras, March 19th to 24th, 29 8 



If the temperature at Ootacamund (7410 E. E. — my place of 

 observations) is compared either with Trichinopoly or with Madras, 

 the decrease of the temperature of the ground for 1 degree C. 

 corresponds to an elevation of from 660 to 670 E. E. A fine spring 

 on the slopes of the Neilgherries, when compared with Trichino- 

 poly, indicates even a more rapid decrease of temperature, 1 degree 

 C. corresponding only to an elevation of 600 to 640 E. E. ; and it 

 seems quite certain that the decrease of the temperature of the 

 ground on the isolated Neilgherry Hills is more rapid than in 

 the Himalayas, where we formerly found an elevation of 720 

 E. E. to correspond to a decrease of the temperature of 1 de- 

 gree C. 



The observations on the temperature, velocity and quantity of 

 water, &c, of various rivers, have been continued throughout the 

 journey, and we think that these observations, when properly com- 

 pared and worked out, may be not without some interest, both in 

 reference to Meteorology and to Geology. 



