482 Correspondence — Mr, B, Mackintosh. 



Professor H. Coquand — The Cretaceous Strata of England and the 

 North of France, compared with those of the West, South-west, 

 and South of France, and the North of Africa. 



J. Evans — On some Cavities in the Gravel of the Valley of the Little 

 Ouse. (See ante, page 443.) 



Dr. E. CrisjD — The Skeleton of a Fossil '\Vhale, recently found on 

 the Eastern Coast of Suffolk. 



H. Hicks — On some Eecent Discoveries of Fossils in the Cambrian 

 Eocks, 



Kev. J. Brodie — Geological Changes that have taken place on the 

 Coast of Britain in recent times. 



C. B. Eose — On the Thickness of the Chalk in Norfolk. 



Eev. W. Fox — On Skull and Bones of Iguanodon. 



H. G. Seeley — On the Eolations between Extinct and Living Eeptiles, 

 and on the Present State of our Knowledge of the Pterodactyle. 



J. Thomson — Notice of certain Eeptilian Eemains found in the Coal- 

 measures of Lanarkshire. 



H. Clarke — Note on the Western Asia-Minor Coal and Iron Basin, 

 and on the Geology of the District. 



Dr. Mann — The Eesemblance and Contrasts of the Climate of 

 Mauritius and Natal. 



Dr. Mann — Eemarks on the Gold Fields of South Africa. 



Professor Tennant — On the Eecent Discovery of Diamonds in the 

 Cape Colony. 



Eev. C. G. Nicolay — On the Diamonds of Brazil. 



J. L. Lobley — On the Eange and Distribution of the British Fossil 

 Brachiopoda. 



S. Jenkins — On the Noted Slate Veins of Festiniog. 



J. Curry — On the Formation of Certain Columnar Structures. 



Professor Goppert — On the Inapplicability of Fossil Plants to sup- 

 port the Theory of Gradual Transformation. 



E. E. Lankester— The Oldest Beds of the Crag. 



Eev. J. Brodie — The Earthquake Tremors which seem to have Pre- 

 ceded the Elevation of the Scottish Coast. 



coI^I^.Es:FOl^^x)E:ts^CE. 



MR. WITCHELL ON THE COTTESWOLD VALLEYS. 



Sir, — For many months past I have not troubled you with 

 any communication on the subject of denudation, as I have been 

 almost constantly travelling in the hilly districts of Devonshire, the 

 Welsh borders, and North Wales. Since I last wrote, very little on 

 this subject has appeared in your Magazine, excepting an article by 

 the accomplished disciple of Playfair, Mr. Geikie, who advocates 

 doctrines for which few geologists would be jorepared, and which 

 are at open varia,nce with the maxim (hitherto regarded as estab- 

 lished) laid down by Mr. Whi taker, ^ that in comparison to the huge 



1 See Geol. Magazine for Oct. and Nov. 1867, Vol. IV. 



