1876 RELIEVED OF GEOLOGICAL LECTURESHIP 335 



rocks are mostly fresh-water or estuarine deposits, that 

 may give some sign of an old valley ; but in Wales 

 there is a great thickness of Lingula Flags and 

 Tremadoc Slates between the Cambrian strata and 

 the volcanic series. ... I know all the New Red 

 series of England north of the Severn, and it contains 

 no volcanic rocks. In Devon it does, see De La 

 Beche s Report on Devon and Cornwall, chap, vii., 

 where you will find something directly bearing on your 

 question in re valleys and volcanoes. 



* We have no Liassic or Oolitic volcanic rocks, and 

 none in the Wealden, though that formation must have 

 been deposited at the mouth of a great river-valley. 

 Neither have we any Cretaceous or Eocene igneous 

 rocks, though there is in these formations evidence of 

 the mouth of another big river-valley. 



The Eifel volcanoes are, in general, on the top of 

 a plateau, in which, however, there were pre-Miocene 

 valleys, if these volcanoes be Miocene. ... I think 

 your letter gives me a glimmering of what you are 

 thinking about in the matter of these old river-valleys 

 and volcanoes, and the subject is quite a new idea to 

 me, and will be to others when you work it out. 



To Miss Johnes he wrote on the 2nd March : k I 

 have pretty good news to tell of myself. This is my 

 last year of delivering lectures in the Royal School of 

 Mines. This will be a very considerable relief in point 

 of work. As I had pay and fees as a professor, they 

 cut off that part of the salary given to Sir Roderick, 

 supposed to represent the Museum as distinct Irom 

 the Survey. Now they are to add ^300 a year to 

 the Survey salary for the Museum, and cut off the 

 Professorship salary, etc., and for that &quot;crowning 

 mercy&quot; I am very glad, and so is Louisa. The fear 



