560 



Report on the Magnetic Survey. 

 Temperature of Rivers. 



[No. 6. 



Names of 



Names of the nearest 



February 



Temperature 



Temperature 



Rivers. 



Places. 



1856. 



of the water at 



11 A. M. 



of the air at 



9 A. M. 









° Centigrade. 



° Centigrade. 



Brahmaputra, . . . 



At Debrooghur, ... 



6 



15.6 



12.4 





Above Dikhoo Mookh,... 



8 



15.7 



12.6 





Above Dhunsiri Mookh, 



9 



16.2 



13.7 





Tezpore, 



10 



17.1 



16.2 





At the mouth of the 











Kulluny, 



11 



17.2 



15.8 





Growhatty, 



13 



17.5 



14.6 





Above D oobree, 



14 



17.8 



17.0 





Below Doobree, ... 



15 



18.4 



19.3 





Bugwa, ... 



16 



19.4 



18.6 





Hajeepore, 



17 



19.3 



18.7 



Zuboona, 



Serajgunge, 



18 



19.6 



20.7 



9) ... 



Amerbad, 



19 



19.7 



22.1 



Kertinana, 



Senpore,... 



20 



21.2 



21.7 



Bargunga, 



Kalaghaut, 



21 



22.8 



22.8 



Damudar, 



Burrissole, 



22 



21.6 



21.8 



Charcolleej 



Bidaboorea, 



23 



21.6 



21.4 



Passur, 



Koolna, ... 



24 



22.0 



20.5 



Seprah, 



Near Grant No. 214 Sun- 











derbunds, 



25 



23.5 



23.4 



Terra Banka, . . . 



Near Grrant No. 155 Sun- 











derbunds, 



26 



23.8 



25.5 



Moree Grunga, . . . 



East of Saugor Island, . . . 



27 



24.6 



26.1 



The variation of the temperature of the air is 26° 1 — 12° 4=13° 7, 

 C, of the water 24° 6—15° 6=9° C. 



In the Dhunsiri and in the Eiju, the difference between the tem- 

 perature of the Dhunsiri near Orang in the valley of Assam and 

 of the Eiju, a lateral affluent of the Dhunsiri at Nurigoon, was 



Dhunsiri, 18° 1 



Kiju, 9 



Djff 9 1 C. 



During my journey from Calcutta to Umballa, I also several times, 

 tried some experiments to measure the heating power of the sun's 

 rays under various conditions. 



I used for a complete observation, the following thermometers : — 



V Dry and wet bulb for temperature and moisture of the air. 

 2. J 



