I. GEOLOGY. 861 



3357a. Table of British Strata, showing the order of their 

 superposition, and the relative thickness of the Formations. 



Henry William Bristow, F.R.S., Director of the Geolo- 

 gical Survey of England and Wales. 



In the construction of this table, the object has been to produce a cheap 

 diagram for educational purposes, and for illustrating lectures on geology. 



When thus used, the four columns into which the table is divided may be 

 printed in separate slips, and then coloured and mounted side by side. Each 

 slip being complete in itself, any one, tAvo, or more may be employed to suit 

 the special purposes for which they are required. Thus, for elementary classes 

 the first three columns may be all that are needed, while for more advanced 

 classes, and in systematic lectures on geology, all may be made use of. 



The mode here adopted of showing the grouping and order of succession of 

 the various geological formations in parallel columns in juxtaposition with 

 each other, places the facts before the eye in the most striking and com- 

 prehensive way. It has also the recommendation of cheapness, an important 

 consideration in the case of schools. 



For reference in the study as well as on an enlarged scale as a diagram, the 

 table is susceptible of extension, as additional parallel columns may be filled 

 up Avith (a), the names of the fossils most common in the several formations 

 in different districts ; (6), the lithological and local characters of the various 

 strata; (c), the minerals usually found in or associated with them ; (d), the 

 useful purposes to which the strata and the mineral substances they contain 

 are applied in the arts, manufactures, &c. ; and (e), the prevailing agricultural 

 characters and peculiarities of the different formations. 



3358. British Hocks. A typical collection of aqueous, 

 metaraorphic, plutonic, and igneous rocks. J. R. Gregory. 



3359. Collection of Fossils. 



Dr. Acland,F.R.S., on behalf of the Radcliffe Trustees. 



3360. British Typical Fossils. An elementary collection 

 arranged stratigraphically. J. R. Gregory. 



3361. Diagrams for Lecture Purposes, Two. The 

 drawings enlarged from Davidson's Monograph of the British Fossil 

 Brachiopoda. 



George Sharman, Museum of Practical Geology. 



Illustrations of characteristic British Carboniferous Brachiopoda. 

 Illustrations of characteristic British Brachiopoda, from various formations. 



336 la. Collection of Fossils most characteristic of the 

 different formations in Russia. 214 specimens. 



Mining School, St. Petersburg. 



