ADVEKTISEMENTS. 



MR. TEJS'NAJSTT, 



MINERALOGIST BY APPOINTMENT TO HER MAJESTY, 



149, STRAND, LONDON, 



Gives practical Instruction in Mineralogy and Geology, He can also supply 



elementary Collections of Minerals, Kocks, and Fossils on the following 

 terms:— £ s. d. 



100 Small Specimens, in cabinet with three trays .... 220 

 *200 Specimens, larger, in cabinet with five trays .... 550 



300 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 parts of the world. 



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

 Geology by Lyell, Mantel, 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 im- 

 bedded 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, PJatina, &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 Carboniferous Rocks. 



SECONDARY FOSSILS, from the Lias, Oolite, Wealden, and Cretaceous Groups. 



TERTIARY FOSSILS, from the Woolwich, Barton, and Bracklesham Beds, 

 London-clay, Crag, &c. 



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

 select. 



EXTENSIVE 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 

 Collection, 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. 



DOUBLE KEFRACTING SPAR.— Mr. Tennant, Geologist, 

 149, Strand, has just received from Iceland some unusually large and fine 

 specimens of this interesting mineral. Mr. Tennant arranges Elementary Collec- 

 tions of Shells, Minerals, Rocks, and Fossils, to illustrate Conchology, Mineralogy, 

 and Geology. He also gives Practical Instruction in Geology and Mineralogy. 



Nearly ready, Price One Guinea, to Subscribers. 



SECTIONS OF THE MOUNTAIN LIMESTONE, 

 SWALEDALE, YORKSHIRE, showing Forty Di.slocations or Veins of 

 Lead Ore, vai-ying in- Throws from One to Forty Fathoms, with the most pro- 

 ductive and unproductive portions of each Vein. By LONSDALE BRADLEY, 

 M.R.A.C., F.G.S. 



Subscribers' names received at the Office of The Geologist, 154, Strand, 

 London, W.C. 



