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THE GEOLOGIST. 



this point Sir Roderick expresses a strong conviction that their antiquity has been 

 rightly stated. 



The information respecting the Permian strata has also been extended by the 

 personal examination of Sir Roderick in Germany, and by materials derived fi-om 

 Giibbier, Geinitz, and Goppert. 



Throughout the work valuable contributions have been deduced from the labours 

 and communications of De Vemeuil, Barrande, Kjeralf, Yon Keyserling, Schmidt, 

 and others ; while several valuable Tables enrich this volume over its predecessor. 

 Of these are especially to be noticed, — a disposition, in parallel vertical columns, 

 of the Order and Dimensions of the Silurian Rocks of England and Wales, by- 

 Mr. Talbot Aveline ; a Table of the Upper Palseozoic Rocks, showing the Equi- 

 valents of the Devonian, Carboniferous, and Permian Strata, in different parts of 

 Europe ; a general Tabular View of the North American Palaeozoic Rocks, by 

 Professor Ramsay ; an elaborate Table of the Vertical Range of all the described 

 Silurian Fossils, by Professor Moms and Mr. Salter. Besides these valuable 

 tables, numerous new sections and diagrams have been added ; indeed, the whole 

 work ranks in the highest scale for the value and elaboration of its contents. 



Catalogue of Mr. Tennanfs Collection of British Fossils. 



This catalogue of Mr. Tennant's private collection exhibits the names of nearly 

 all the ordinaiy and typical fossils of the British rocks, and a limited number of 

 copies have been printed on one side of the paper only, to allow^of then being cut 

 up into labels. 



The bibliographic list appended to the catalogue is a useful and valuable 

 addition, and ought to aid materially the sale of the work. In it are given the 

 titles of the best works necessary for the instruction of the student, with curt and 

 pertinent remarks in each case of their nature and character, and of the leading 

 topics of their contents. 



Elementary Geological Diagrams. London : James Reynolds, 174, Strand. 



Mr. James Reynolds, of 174, Strand, has long been known for the numerous 

 diagrams of scientific subjects which he has pubhshed. 



He has now produced, under the editorship of Professor John Moms, whose 

 name to the work should alone be a guarantee of its worth, a set of elementary 

 diagrams, illustrating the fii-st principles of the important and practical science of 

 Geology. 



The series comprises an enlarged and improved general ideal " Section of the 

 Earth's Crust," based upon the original excellent diagram in Dr. Buckland's famous 

 " Bridgwater Treatise ;" a valuable "Table of the Order and Succession of the 

 Stratified Rocks," by Professor Morris, in which, however, we are sorry to find he 

 continues the unfortunate misnomer of Coralline Crag for a deposit which contains 

 no corals at all. If the object be to designate this bed by the natm-e of its most 

 characteristic organic remains, the term Bryozoau should be appKed ; but it would 

 be far better, in our opinion, to adopt the term Lower Crag for this deposit, and 

 that of Upper for the Red Crag. The other diagi-ams are, " Various Forms of 

 Stratification ;" " Section of the London Basin," with springs and Artesian wells ; 

 " Carboniferous Group — Coal and Iron Strata;" "Section of a Copper Mine;" 

 " Interior of a Coal Mine." Of these the illustrations of stratification might 

 have been more carefully drawn, and the section of the London Basin is artificial 

 and highly exaggerated ; but we would speak of the others in favourable 

 tenns, and we shall be glad to know that such efforts to teach the gi'eat truths of 

 science by simple and inexpensive means meet with the patronage they deserve. 



