TABLE OF CONTENTS. 



PA6H 



Phofessoe a. C. Ramsay. — Tiie Physical Structure of Merionethshire and 



Caernarvonshire 169 



The Rev. J. E. Vaux, — Notices of the Volcanic Rocks and Geysirs of Iceland 



{continued) 175 



PitOFESso I L. DE Ko>:iNCK. — On some New Palaeozoic Crinoids from England and 



Scotland [continued) 173 



James Buckman. — The Practical Application of Geology in Coal- seeking 



{continued) 184 



John Morris. — British Fossils, Stratigraphically Arranged {continued) - - 189 



Dr. T. L. Phtpson. — Foreign Correspondence - 194 



T. RiPBRT Jones, — On an Erroneous Statement of the Occurrence of Natural 



Human Footprints in the Palaeozoic Rocks 204 



Notes and Queries 205 



Reports of Geological Societies 210 



Reviews - -213 



MR. TEOTAl^T, MINEEALOGIST BY APPOINTMENT TO HER 

 MAJESTY, 149 STRAND, LONDON, 

 Gives practical Instruction in Mineralogy and Geology. He can also supply elementary 

 Collections of Minerals, Rocks, and Fossils on the following terms : — '■ 



£ 8. d. 



100 Small Specimens, in cabinet with three trays . . 2 2 0 

 *200 Specimens, larger, in cabinet with five trays . . . 6 5 0 

 3O0 Specimens, larger, in cabinet with eight drawers . . 10 10 0 

 400 Specimens, larger, in cabinet with twelve drawers . 21 0 0 

 More extensive Collections, either to illustrate Mineralogy or Geology, at 50 to 100 

 Guineas each, with every requisite to assist those commencing the study of these 

 interesting branches of Science, a knowledge of which affords so much pleasure to the 

 traveller in all p irts of the world. 



* A Collection for Five Guineas, which will illustrate the recent works on Geology 

 by Lyell, Mantell, Ansted, Page, and others, contains 200 specimens, in a Mahogany 

 Cabinet, with five trays, comprising the following specimens, viz : — 



MINERALS which are either the components of Rocks, or occasionally imbedded in 

 them : — Quartz, Agate, Chalcedony, Jasper, Garnet, Zeolite, Hornblende, Augite, 

 Asbestus, Felspar, Mica, Talc, Tourmaline, Calcareous Spar, Fluor, Selenite, Baryta, 

 Strontia, Salt, Sulphur, Plumbago, Bitumen, &c. 



^ NATIVE METALS or METALLIFEROUS MINERALS: these are found in masses, 

 in beds, or in veins, and occasionally in the beds of rivers. Specimens of the following 

 Metallic Ores are contained in the Cabinet : — Iron, Manganese, Lead, Tin, Zinc, 

 Copper, Antimony, Silver, Gold, Platina, &c. 



ROCKS : — Granite, Gneiss, Mica-slate, Clay-slate, Porphyry, Serpentine, Sand- 

 stones, Limestones, Basalt, Lavas, &c. 



PALEOZOIC FOSSILS, from the Llandeilo, Wenlock, Ludlow, Devonian, and Car- 

 boniferous Rocks. 



SECONDARY FOSSILS, from the Lias, Oolite, Weal den, and Cretaceous Groups. 



TERTIARY FOSSILS, from the Y/oolwich, Barton, and Bracklesham Beds, 

 London-clay, Crag, &c. 



In the more expensive Collections some of the specimens are rare, and all more 

 select. 



TXTENSIVE AND VALUABLE COLLECTION OF MINERALS. 



Mr. Tennant bought at the Stowe Sale the Duke of Buckingham's Collection of 

 Minerals, which he has greatly enriched by a Collection of Coloured Diamonds, 

 Australian Gold, and many other specimens of great value and interest. The Collec- 

 tion, consisting of 3,200 specimens, is in two cabinets, each containing thirty 

 drawers, with a glass case on the top for large specimens, and is offered at jg2,000. 



Such a Collection is well adapted for any public Institution. 



TROUBLE REFRACTIJSG SPAR.— Mr. Tennant, Geologist, 149 Strand, 

 y*-^ has just received from Iceland some unusually large and fine specimens of this 

 interesting mineral. Mr. Tennant arranges Elementary Collections of Shells, 

 Minerals, Rocks, and Fossils, to illustrate Conchology, Mineralogy, and Geology. He 

 also gives Practical Instruction in Geology and Mineralogy. 



