90 
THE GEOLOGIST. 
tliis point Sir Roderick expresses a strong conviction that their antiquity has been 
rightly stated. 
The information resjiecting the Permian strata has also been extended by the 
personal examination of Sir Roderick in Gemiany, and by materials derived from 
Gnbbier, Geinitz, and Goppert. 
Throughont the work valuable contributions have been deduced from the labours 
and coninuuiications of De Verneuil, Bixi-rande, Kjerulf, Von Keyserling, Schmidt, 
and others ; while several valuable Tables enrich this vohmie over its predecessor. 
Of these are especially to lie noticed, — a disposition, in parallel vertical columns, 
of the Order and Dimensions of the Silurian Rocks of England and Wales, by 
Mr. Talbot Avelinc ; a Table of the Upper Palaeozoic Rocks, showing the Equi- 
valents of the Devonian, Carboniferous, and Permian Strata, in different parts of 
Eiu'ope ; a general Tabular View of the North American Palfeozoic Rocks, by 
Professor Ramsay ; an elaborate Table of the Vertical Range of all the described 
Silurian Fossils, by Professor Morris and Mr. Salter. Besides these valuable 
tables, nimierous new sections and diagi'ams have been added ; indeed, the whole 
work ranks in the highest scale for the value and elaboration of its contents. 
Catalogue of Mr. Tennant's Collection of British Fossils, 
This catalogue of Mr. Tennant's private collection exhibits the names of nearly 
all the ordiuiuy and typical fossils of the British rocks, and a limited number of 
copies have been printed ou one side of the paper only, to allow of their being cut 
up into labels. 
The bibliogi-aphic 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 instraction of the student, with curt and 
pertinent remarks in each case of their nature and character, and of the leading 
topics of then: contents. 
Mementa/ry Geological Diagrams. London : James Reynolds, 174, Strand. 
Mb. James Reynolds, of 174^ Strand, has long been known for the numerous 
diagrams of scientific subjects which he has pubUshed. 
He has now produced, under the editorship of Professor John Morris, whose 
name to the work should alone be a guarantee of its worth, a set of elementary 
diagrams, illustrating the first prmciples of the important and practical science of 
Geology. 
The series comprises an enlarged and improved general ideal " Section of the 
Earth's Crast," based upon the original excellent diagram in Dr. Buckland's famous 
" Bridgwater Treatise ;" a valualde " Table of the Order and Succession of the 
Stratified Rocks," by Professor Morris, in which, however, we are sony to find he 
continues the uiifortunate misnomer of Coralline Crag for a deposit which contains 
no corals at all. If the object be to designate tliis bed by the nature of its most 
characteristic organic remains, the term Biyozoan should be applied ; 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 diagrams are, " Various Forms of 
Stratification ;" "Section of the London Basin," vnt\\ 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 dra\vn, and tlie section of the London Basin is artificial 
and highly exaggerated ; but we would speak of the others in favourable 
terms, and we shall be glad to know that such efforts to teach the gi'eat truths of 
science by simple and inexi>ensive means meet with the patronage they deserve. 
