412 Miscellanies. 



30. Mr. Murchison on the Geology of Wales. — This eminent 

 geologist has occupied himself during the last three years in survey- 

 ing geologically this principality, and we may expect a work from 

 him on its transition rocks — Mr. Murchison's letter to the editor, da- 

 ted April 18, 1834. 



31. Mr. De La Beche^s Manual. — A third edition of this valua- 

 ble work has been published, much enlarged and improved by the 

 author. 



32. Researches on Theoretical Geology, by Mr. T. De La 



Beche. — This work, containing an interesting series of reasonable de- 

 ductions from Geological facts and phenomena and a condensed and 

 luminous summary of them will be read with advantage, by those who 

 have made some progress in the science. We learn from Mr. De La 

 Beche, that he does not intend at present to publish a new edition 

 of his section of the strata above the grauwacke. 



33. Opossum in the Stonesjield Slate, near Oxford, England. — 

 The Stonesfield Slate belongs' to the lowermost beds of the oolite ; 

 of the Didelphian, (Opossum) being of that period, there cannot be 

 a shadow of a doubt. Mr. Mantell in a letter to the Editor, June 

 18, 1834, Brighton, England. 



It will be remembered that the remains of the opossum, found in 

 the place above named, present the only known instance of a vivip- 

 arous vertebrated fossil animal, found lower than the chalk. 



This does not however, invahdate any principle of geology ; it 

 goes only to prove that viviparous animals appeared earlier than had 

 been supposed. 



34. Mr. Lyell and his Geology. — We learn by a letter from Mr. 

 Mantell, that Mr. Lyell has gone to Sweden and Norway to exam- 

 ine into the proofs afforded of the gradual elevation of those countries 

 which is supposed to be still going on. 



A new and cheap edition of Mr. Lyell's Geology has recently 

 been published in London. It consists of 4 Vols. 12mo. illustrated 

 with 147 wood cuts, and 13 plates and maps, price 245. Sterling. 

 It is added in Loudon's Mag. for October, 1834, that since the pub- 

 lication of the former editions of them, the author has travelled over 

 a large part of the continent of Europe, for the purpose of verifying 

 facts and collecting new materials. In the present edition, he has 



