Eeviervs — Bonney's Elementary Geology. 827 



Heidelberg to Carlsruhe has just been issued by Dr. Beneclce and 

 Dr. Cohen. The district examined stretches as far south as Stettfeld, 

 and as far east along the Mosbach road as Waibstadt, and includes 

 the neighbourhood of Sinsheim and a considerable portion of the 

 valley of the river Elsenz. Deposits ranging from the Bunter Sand- 

 stein and the several divisions of the Muschelkalk up to the Loess, 

 not to mention eruptive beds of nephelinite, are given in colour ; 

 and the use of the map for field-work is greatly enhanced by the 

 introduction of contour lines faintly marked with red. " Blatt I.," 

 which will embrace the town of Heidelberg and the area immediately 

 north, is to appear next year, and will be accompanied by an explana- 

 tory text. It would perhaps still further increase the usefulness of a 

 very excellent map if deposits which have been turned to economic 

 purposes were also indicated. We have been led to make this re- 

 mark, as we find, for example,' at Altwiesloch, no mention of the beds 

 of zinc ore which occur there. Mr. Karl Triibner's Geological Map 

 will doubtless prove very acceptable to the numerous students in the 

 ancient University of Heidelberg and elsewhere. 



II. — Manuals of Elementary Science. Geology. By T. G. 

 BoNNEY, M.A., F.G.S., etc. Foolscap 8vo., pp. 128. Illustrated. 

 (London : Society for Promoting Christian Knowledge.) 



n^HE above is one of a series of Elementary Manuals now being 

 i published by the Society for Promoting Christian Knowledge, 

 and is intended by the author to serve as an introduction to the more 

 advanced text-books on the science. 



The principal features of the work are, first, a description of the 

 chemical composition, etc., of the various rocks and minerals. 

 Secondly, the modes of operation of the various agents producing 

 changes of the earth's surface, which are treated of at some length 

 and in an admirable manner. And, finally, a brief description, con- 

 densed into three chapters, of the various sedimentary rocks in 

 chronological order, commencing with the oldest. With each series 

 is also given its locality, extent, character, and " Life History." 

 Mr. Bonney's style of writing is simple and popular, and, we should 

 think, would certainly be "intelligible to any fairly educated boy or 

 girl of fifteen." So that the book forms a convenient stei^ping-stone 

 between the little " Science Primer" by Prof. Geikie (mentioned in 

 a previous Number) and the more advanced works on Geology. 



The " get-up " of the work in other respects, as compared with 

 that of the " Science Primer," is poor. Though the type is clear, 

 the paper is inferior ; and some of the woodcuts have a worn-out 

 and old-fashioned aspect, thei-eby greatly detracting from the value 

 of the book, and giving the impression that the publishers had an 

 eye to economy. We trust they will sj)end a little more in illus- 

 trating the next edition, and also the remainder of the set, for 

 without good figures works of this kind are useless for teaching 

 purposes. 



