1S75.] 



Variation of the Sim's Seat. 



35 



the mean of the six differences to represent the solar intensity of the month. 

 The result, as will be seen from the following table, is in complete accord- 

 ance with that previously arrived at from other data. The same thermo- 

 meter has been in use throughout. 



Table V. — Solar intensity at Darjiling. 



Stations. 



1870. 



1871. 



57-8 



62-2 



63-3 



64-2 



67-8 



68- 



66-2 



65-7 



69-3 



68-2 



67-3 



66-3 



1872. 



1873. 



1874. 



1875. 



January, 



February, 



March, 



April, 



May, 



June, 



July, 



August, 



September, 



October, 



November, 



December, 





62-2 



67- 



63-3 



70-8 



71-5 



65-5 



62-5 



59- 



67-7 



62-8 



63-5 



63-2 



66-8 



67-3 



65-7 



66-8 



63-7 



70- 



62-5 • 



59- 



59-2 



62-3 



62- 



62-8 



63-8 



62-5 



60-8 



60- 



62-3 



63-3 



57-3 



53-8 



57-8 

 56-5 

 58-2 

 55-7 

 59-8 

 59-2 

 56-3 

 57-8 

 59-3 

 60-8 

 63-3 

 60-5 



62-3 

 60-3 

 57-8 

 60-2 



Year, . 





65-5 



64-9 



60-8 



58-6 





VII. — Notes on the Geology of part of the Dafla Hills, Assam ; lately visited 

 oythe Force under Brigadier-General Stafford, G. B. — By Major 

 H. H. Godwin-Atjsten, F. B. G. S., F. Z. S., &c, Deputy Superin- 

 tendent Topographical Survey of India. 



(Received June 18th, — Read July 7th, 1875.) 

 (With Plate VI.) 

 My survey duties with the late expedition into the portion of the 

 Eastern Himalaya known as the Dafla Hills gave me an opportunity of 

 making a few notes on the geology of this portion of the North-eastern fron- 

 tier, of which so little is known up to the present time. 



From the Brahmaputra near Bishnath and Dunsiri Mukh, the outer 

 range of the Tertiary sandstones is well seen, the steep scarps shewing white 

 against the dense forest with which they are covered. I first entered this 

 outer range by a route up the bed of the Darpang stream, a tributary of 

 the Pichola, when proceeding to clear the hill Dihirhi Parbat for a Trig- 

 onometrical station. After leaving Borpathar, the road leads over the plain 

 in a direction WNW., and after 5 miles the shallow bed of the Darpang is 

 followed up and leads directly by a narrow gorge into the hills : these rise 

 suddenly from the level plain of recent detritus, no outlying beds of later 

 age being seen here. 



