214 



Report on the Progress of the Magnetic Survey. [No. 3. 



Place of Observation, 



Chubouval, 



Kewrah, 



Shapore, 



Jliung, 



Mooltan, 



Khanpore, , 



Naushera, 



Sukkur, 



Kurrachi, 



Mugribi, 



Groon in tbe Runn 



Subput, 



Bhooj, 



Date. 



20th Dec., 



23rd „ 



26th „ 

 1st Jan., 

 4 to 12th „ 



22nd „ 



24th Feb., 



25th „ 



26th „ 

 8th Mar., 



10th „ 



12th „ 



26th „ 



Sur- 

 face. 



27-6 

 32-0 

 35-2 

 36-0 

 360 



20-0 

 37'0 

 48-0 

 50-0 

 520 

 540 

 55-0 



0.3 



Meters 

 above 

 Sur- 

 face. 



12-0 

 17-4 

 13-5 

 15-4 

 14-5 



14-5 

 18-3 



17-4 

 17-5 

 27-5 

 25-0 

 31-4 



Metees. 

 Meters below surface. 



17-4 

 20-6 

 20-5 

 177 

 19-4 

 16-4 

 18-9 

 21-6 

 25-3 

 27-2 

 26-5 

 24-0 

 28-9 



21-6 

 24-2 

 18-6 

 23-4 

 21-1 

 22-2 

 21-6 

 255 



26-8 

 24-1 



28-2 



28-2 



25-5 



This Table evidently shows a great increase of the temperature 

 of the ground the more we advance to the South ; the increase is 

 especially rapid between Upper and Lower Sind (Sukkur and 

 Kurrachi.) 



There seem however to be great irregularities in the temperature 

 of the ground, the increase being not strictly proportional to lati- 

 tude or to isothermal curves of the air. 



The irrregularities in the temperature of the ground are chiefly 

 produced by the variations in the quantity of water contained in the 

 ground, and places in which water is found close underneath the 

 surface have a colder temperature of the ground than localities 

 where water can be obtained only at a greater depth. 



The depth of wells was therefore constantly registered, and obser- 

 vations were made to ascertain the quantity of water contained in 

 the ground by weighing samples of earths of different depths as 

 soon as they were taken out. These samples, after being carefully 

 dried, were weighed again and thus the amount of moisture could 

 be calculated. 



Jungles also tend to cool the temperature of the ground, and I 

 think, that, when we have the opportunity of comparing the tem- 

 perature of the ground with depths of wells, with jungles, &c. many 

 striking facts will be found to prove that irregularities of the tern- 



