ADVERTISEMENTS. 



3 



IMPHOYED ACHROMATIC MICEOSCOPES for Students, 

 From £3 3 0 



Society of Arts Microscope 3 3 0 



Botanical Microscopes, with compound powers, fitted in mahogany cases, from 

 6s. 6d. and upwards. 



Stanhope and Codington Lenses, Thin Glass Circles and Squares, Plain Glasses, 

 Rings, and Cells of every description, for mounting microscopic objects. Improved 

 Frog Plates and Live Boxes. 



At JOHN" WARNER'S Photographic and Philosophical Instrument Manu- 

 factory, 72, Fleet-street, London, E.G. 



SOWERBY, CoNCHOLOGiST AND PUBLISHER, Established 50 Years, 

 removing from 61, opposite the British Museum, to 164, Strand. Mr. Cal- 

 vert, the great travellei-, has carried on this business for the last few years, and 

 now has determined upon removing to his Mining and Engineering Offices in the 

 Strand, his large Stock of Scientific Books, Minerals, Fossils, Shells, Precious 

 Stones, Cabinets, Boxes, Trays, Tablets, Tubes, Glass-top Boxes, Geological Maps, 

 Diagrams, Hammers, Blowpipes, Bags and Dredges, &c., &c. 



GEOLOGICAL COLLECTIONS in great variety :— 



Class A consists of rock specimens, including all the strata from the Drift to 

 the Gneiss, stratigraphically arranged, as well as the Granites, Porphyries, Sienites, 

 Greenstones, Traps, Serpentine, Trachytes, Basalt, Lavas, &c. Class B consists 

 of the former with the addition of the Minerals and Ores of Metals introduced 

 with the rock in which they are found. Class C consists of Class A with cha- 

 racteristic Fossils added. Class D embodies B and C, and constitutes the most 

 complete and useful series that has ever been placed in the hands of the traveller 

 or student. Class E represents Palaeontology only. Class F consists of the 

 Geographical series of Rocks and Fossils. 



These collections have none of the muddle of the old German school about 

 them, but illustrate clearly and simply the Science as it now stands according to 

 our best authors, and have been adopted by the Natural^History Collecting 

 Association. 



CONCHOLOGY :— 



Class G, Genera of Recent and Fossil Shells ; no Geologist should be without 

 one of these collections. Class H, British Shells. Class I, Geographical Series. 



MINERALOGY :— 



Class K, The Earths and Ores of Metals arranged according to their chemical 

 bases. Class L, Collections of Crystallized specimens. Class M, Miners' Collec- 

 tions, shewing every variety of Ore. Class N, Architects' and Engineers' Col- 

 lections, illustrating durability and hardness. 



The brilliant, living, and fine Conchological specimens collected by Mr. Calvert 

 during the last twenty-three years, entirely throw in the shade the dead, faded, 

 and overcleaned Sowerby Stock. 



J. F. Calvert, C.E., Mining Survey Offices, 164, Strand. 



FOSSILS BISCOVESED IN THE EXCAVATIONS FOR THE MAIN DRAINAGE. 



Cyrena Dulwichiensis, Fitharella 2 Richmani, Leaves, dsc. 



Sets of these Fossils from Dulwich and Peckham, numbering 15 to 20 varieties, 

 from 10s. 6d. to Five Guineas, may now be obtained by enclosing Post Office 

 Order (on North Brixton Office) payable to Mr. Charles Riokman, 17, Grove- 

 place, Brixton-road, London, S. 



Stereoscopic Slides, Nos. 1 and 2, Cyrenea Dulwichiensis, and Liranceea ? Rich- 

 mani, photographed from groups in the British Museum, forwarded by post on 

 receipt of 14 stamps each slide. 



