XIV 
INTRODUCTION. 
by Orton, and Sedbergh, and through Garsdale to Hawes. Again I as- 
cended Addleburgh, repeated observations at Askrigg, crossed the Stake, 
redescended Bishopdale, again crossed over Pen hill, and after clearing 
certain difficulties in Coverdale, once more walked to Hawes and re- 
descended W ensleydale. 
In the autumn of this year I reviewed Ribblesdale, ascended Peny- 
glient. Fountains fell and Wharnside, and measured every visible bed 
in these noble mountains, in two or three directions (as I had done 
for Ingleborough and Penyghent in 1824 and 1827) and passed again 
through Dentdale, Ingletondale, and Kingsdale, to verify former notices. 
Later in the year I again left home with my friend M. De Billy 
of Strasburgh, passed by Middleham, Leyburn, Bolton castle and Reeth, 
to Richmond ; and, after some further research in Swaledale, walked 
to Mr. Witham’s at Lartington hall, to join Mr. Salinond in a third 
tour of Teesdale. We gave much attention to the Whin sill and 
the Whin dykes from Middleton to the summits of Maizebeck and 
Troutbeck, twice crossed the Penine chain from Teesdale to Dufton, 
and followed the Eggleston Whin dykes to the north-east and east, 
being aided in the research by Mr. Stagg and Mr. Richardson of 
Middleton, and Mr. Prattman the proprietor and Mr. Forster the 
agent of Butterknowl colliery. I ascended Mickle fell and measured 
all its beds in two directions, saw the Tan hill collieries, investigated 
the intricate phenomena near Brough (Westmoreland), examined the 
country near Lartington with Mr. Witham, and Brough near Catterick 
with Mr. Lawson, and gathered new information near Richmond, 
Gilling, and Middleton Tyas. 
In the summer of 1834 1 reviewed the districts between Wharfe- 
dale and Nidderdale, and Nidderdale and Yoredale, for the purpose 
of completing my views of the millstone grit series, and the lime- 
stone of Upper Nidderdale. In the autumn of this year I saw some 
districts of basalt and limestone in Northumberland in company with 
Mr. Wm. Hutton and other friends. 
