1854 THE MEMOIR ON NORTH WALES 213 



visiting the ground. Accordingly he took up his 

 quarters during part of the summer of 1854 at his old 

 station, Llanberis. A few passages from his letters 

 will give a picture of his life and work there. Writing 

 to Aveline on the 7th June he tells how an illness there 

 had retarded him, and adds : * If I can walk a mile or 

 two to-day I shall try several more to-morrow, and if 

 that succeed, leave this suddenly. I have now got to 

 that part of the Memoir that deals with the Bala beds 

 and Caradoc, from Mallwyd all round by Yspytty 

 Evan to Conway, and am especially hard up for in- 

 formation in places. Will you turn up your note-books 

 and copy out any descriptions of the structure of the 

 rocks, etc. ? Never mind digesting them into regular 

 description more than you like ; only give me any 

 notes you have, and I '11 quote them in your own words 

 when I can. I am at present incorporating what 

 Jukes gave me about the Bala Limestone and ash, 

 and of course what I chiefly want is anything about 

 the rocks above that.' Again on the i6th he writes 

 to the same correspondent : ' On Monday, after an 

 early dinner, I took a gig to the top of the Pass, and 

 then started across the hills for Ffestiniog, in part over 

 a bit of country I had not been on before. I was 

 anxious to see it before describing its rocks. I passed 

 by the lakes called Llyniau, under the west end of 

 Moel Siabod, and through the upper part of Dolwydd- 

 elan, and down by Manod-bach. The greenstones are 

 right. I reached Martha's about ten at night, and got 

 a hearty reception and supper. Next morning a com- 

 mercial gent gave me a lift to Trawsfynydd, where I 

 struck into the country, and went over Craig-y-Das- 

 Eithen and down by the back of Penmaen and Cwm 

 Eisen to Tyn-y-groes, where I dined, and went on to 



