1848.] Ethnography and Geography of the Sub -Himalayas. 545 



graphy of Tibet and the Himalayan region, and he and I want you 

 and other friends in the Norwest, to let us know what you think of 

 this skeleton, and to help us to amend and fill it up before we com- 

 mence a serious project we have on the tapis, viz. disposing all the 

 plants and animals according to their territorial arrangement, and thus 

 demonstrating its utility and value. Here is the outline :— 

 Lengthwise division of the Sub-Himalayas into basins — 



1. Alpine basin of the Indus. 



2. Alpine basin of the Ganges. 



3. Alpine basin of the Karnali. 



4. Alpine basin of the Gandak. 



5. Alpine basin of the Kosi. 



6. Alpine basin of the Tishta. 



7. Alpine basin of the Dihong. 



I suppose this series of basins to be formed by the pre-eminent snowy 

 peaks, and I have perfect proof that such is the fact in Nepal, where 

 Dhoulagiri, Gosainthan and Kanchan form most precise deltizers of 

 the very perfect deltic basins of that part of the mountains. I cannot 

 however so well find deltizing peaks W. and E. of Nepal. I want you 

 to help me in that search, and also to say if you think practical utility 

 would be forwarded by additional basins ? and if the physiognomy of 

 the western hills requires or sanctions a separation of the basins of the 

 Sutlege from the Indus, or of the Jamna from the Ganges? Remem- 

 ber however always that though it be interesting to show the cause of 

 the series of Sub-Himalayan basins, yet the series may be good though 

 the cause be bad. Therefore look for causative snowy peaks, but don't 

 reject the deltic basins because you find them not, or not all of them, 

 or even some peaks that seem to conflict with the theory. Next we 

 have the transverse or breadthwise division of the Sub-Himalayas into 

 the following series, primarily triple, but in whole quinary, thus : — 



Breadthwise climatic division — 



Miles. 



1 . Northern region, or Cachar, 30 



2. Central region, 30 



{Subdivided into Lower" 



hills, 1—10 . 



Forest, 2-10 V 



Tarai, 3—10 



