NOTBS AND COiVlMENTS. 



IMIOTOGRAPHV AND GEOLOGY. 



The second issue of British Geological Piiotographs, pub- 

 lished by the British Association Committee, has been sent out 

 by the Secretary, Prof. W. W. Watts. It includes i8 half 

 plates, four quarter plates, and four whole plates, and each 

 photograph is accompanied by detailed particulars. In this 

 series it is pleasing" to find a good proportion of north countrv 

 views, from negatives made by Mr. Godfrey Bingley and Prof. 

 E. J. Garwood. There are views of important sections in 

 Teesdale, Yorkshire, Lancashire, Nottinghamshire, and West- 

 morland in the series. Almost as valuable as the photographs 

 themselves are the excellent descriptions (sometimes accom- 

 panied by explanatory diagrams). One of these (by Prof. 

 Garwood) is given below, together with one of the sketches. 



HIGH FORCE, TEESDALE. 



This is a classical waterfall, described by Sedgwick in 1823, 

 Wm. Hutton in 1831, and Phillips, 1836. The fall is 70 feet 

 high, over the Whin Sill, which is here intrusive in the Lower 

 Yoredale Beds. The photograph shows the chief fall (A) near 

 the right bank of the Tees. It is working along a joint in the 

 hard Whin which forms the protective cap to the fall ; when in 

 flood surplus water also pours through a second joint near the 

 left bank (B). The undercutting of the limestone is shown by 

 the caves and the hanging icicles ; the gorge below bears 



m'MMiSSP- 





The Whin Sill, at the High Force. 



ino3 September i. 



