372 Analyses of Books. [May, 



where these differ from the terms in general acceptation. Mr. 

 de la Beche, we observe, gives the " new red conglomerate," 

 as the equivalent formation to the " rothe-todte-liegende," 

 placing the latter between the alpenkalkstein (magnesian lime- 

 stone) and the porphyr gebirge of Keferstein (new red porphyry, 

 porphyre du gres rouge), which is succeeded. by the coal mea- 

 sures : and in the preface we find the following observation on 

 this subject : — " With respect to the identity of the new red 

 conglomerate with the rothe todte liegende of Germany, it may 

 perhaps be right to mention, as discussions have lately taken 



Slace on this subject between the Rev. W. D. Conybeare and 

 Ir. Weaver, that the conglomerate usually termed new red con- 

 glomerate, in the neighbourhood of Exeter and Teignmouth, 

 seems closely to resemble the rothe todte liegende, as has been 

 already stated by Prof. Buckland ; the magnesian limestone is 

 unfortunately wanting in that country, or at least has not been 

 described, though traces of it are mentioned by Mr. Conybeare 

 (Outlines of the Geology of England and Wales, p. 308) at Samp- 

 ford Peverell, in Devonshire, for beneath that rock the German 

 rothe todte liegende is always described as occurring." 



The next article is M. Brongniart's Table of the Classification 

 of the Mixed Rocks, from the Journal des Mines, which we are 

 glad to see in an English dress ; for, with the exception of Dr. 

 Macculloch's, we think it the only useful arrangement of those 

 important substances that has yet been devised : though we are 

 also of opinion that a combination of the two might be effected, 

 with some additions, perhaps, from M. de Leonhard's new 

 " Charackteristik der Felsarten," which would be preferable to 

 either. We would likewise suggest to some mineralogical geo- 

 logist the propriety of determining a series of the British rocks 

 according to the classification of M. Brongniart, and of publish- 

 ing a table of their localities. 



The memoirs from the Annales des Mines then succeed, and 

 are as follows : — Geological Sketch of the Coal District of 

 Saint-Etienne ; by M. Beauier (with a geological map). 

 Memoir on the Geographical Extent of the Formation of the 

 Environs of Paris; by M. d'Omalius d'Halloy (with a geological 

 map). Extract of a Memoir on the Possibility of causing Fresh- 

 Water Molluscte to live in Salt-Water, and Marine Molluscae in 

 Fresh-Water, with geological Applications; by M. Beudant. 

 On Gabbro ; by M. Von Buch. Memoir on the Mountain of 

 Rock Salt at Cardona, in Spain ; by M. P. Louis Cordier. 

 Observations on the Formations of Ancient Gypsum occurring 

 in the Alps, particularly on those considered as primitive ; pre- 

 ceded by new Facts relative to the Transition Rocks of that 

 Chain ; by M. Brochant de Villiers (with a lithographic map, 

 sections, &c.) Geological Sketch of the Thuringerwald ; and 

 on some Basaltic Mountains of Hesse andThuringia ; by M. de 

 Hoff. Report on the Tin of Periac (dep. of the Loire Infcre.) ; by 



