SCIENCE-GOSSIP. 



Just Published. Price 55. Post Free. 



APPLIED GEOLOGY. 



PART I. 



By J. Y. ELSDEN, B.Sc. (London), F.G.S. 



Demy 8vo, bound in cloth. Profusely illustrated. 



THE QUARRY PUBLISHING CO., LTD., 



5, Arundel Street, Strand, London, W.C. 



MINERALS, ORES, 

 ROCKS, FOSSILS, &c 



" What they are" and " Where they are found." 



In this " Elementary Geological Series " are five sets, each sat 



containing 20 i amed and located specimens, with descriptive 

 notes. In cases 11 x 7 x i£, post free, 3s. 



SET Ho. 26.—" Metallic Minerals ," contains 20 named Specimens 

 of Metallic Minerals and Ores, In which the principal groups 

 are represented, including Ores of copper, iron, lead, zinc, 

 tin &c. : 2s. 6d. 



SET Ho. 27.— "E arthy Minerals," contains 20 named Specimens 

 of Earthy Minerals, including Fluor, Apatite, Felspar, Talc, 

 Hornblende, &c. ... ... ... ... 2s. 6d. 



SET Ho. 28.— " Igneous Rocks," contains 20 named Specimens of 

 Igneous, Vocanic, and Metamorphlc Rocks, including Obsi- 

 dian, Trachyte Granite, Lava, Basalt, &c ... 2s. 6d. 



SET Ho. 29.—" Sedimentary Rocks, " contains 20 named Specimens 

 of Sedimentary Rocks, including Crag, Gault, Oolite, Lias, 

 Limestone, Sandstone, &c. ... ... ... 2s. 6d. 



SET Bo. 30.—" Foss Is," contains 20 named Specimens of British 

 and othf>r Fossils, including examples from Crag, Eocene, 

 Gault, Oolite, Carboniferous, &c. ... ... 2s. 6d. 



The above 100 Specimens of Minerals, post free, 12s. 6d. 



SET Ho. 5*. — " Pre, iaus Stones, " contains 20 well-known examples 

 of stones in use for jewellery and ornamentation, as found in 

 nature, from various parts of the world, with their specific 

 localities, &c. 8s. 0d., or post free, 5s. 6d. 



See Editorial h'otice, January Nc. of "Science-Gossip," 

 and write for full Catalogue post free. 



W. WATSON & SONS 



&T 



COX & CO., 99 & 101, NEW OXFORD ST., LONDON. 



"FRAM" MICROSCOPE 



Highest JJlass Microscope at a yery moderate cost. 



Coarse Adjustment. — Watson's dia- 

 gonal rack and pinion. 



Fine Adjustment. — Watson's lever 

 form. 



Tripod Foot, with 7-in, spread. 



Stage. — Nelson's horseshoe pattern, 

 3§ by 3f in. 



Body Length. — 152 mm. With draw- 

 tube extended, 250 mm. Objective 

 thread at lower end of draw-tube. 



Fittings of universal size throughout. 



Under Fitting arranged to turn out 

 from optic axis when desired. 



PRICES. 



Set X. " Fram " Micro- 

 scope, with one eye- 

 piece, Watson's Para- 

 chromatic 1/6 in. and 

 choice of 1 In., 1/2 in. 

 or 2/3 in., complete 

 in Mahogany case, 

 £6 15s. 



Set XI. Complete as 

 per Set X., with the 

 addition of Abbe Illu- 

 minator having Iris 

 Diaphragm.and extra 

 Eyepiece, £8 5s. . 



Full particulars of the above, also complete Catalogue »f Micro- 

 scopes, forwarded post free on application to 



W. WATSON & SONS, 



313, HIGH HOLBORN, LONDON, W.C. 



„ ra „ fl ,, . j 16, Forrest Road, EDIHBURGH. 



arancnes. -j 7g> 8wanston street, Melbourne, AUSTRALIA. 



TRILOBITES 



From the Upper Silurian of Dudley. 



Phacops caudatus, is. 6d. to 15s. 

 Acidaspis coronata, 2s. to 4s. 

 Calymene Blumenbachii,5S. to 

 12s. 6d. 



Phacops Downingiae, is-.6d. to 5s. 

 Encrinurus variolaris, is. 6d. to 



3s. 6d. 

 Homolonotus, 3s ~6d. to 7s: 



A few Upper Silurian Crinoids, Corals and Brachiopods. 



COLLECTIONS TO ILLUSTRATE GEOLOGY AND PHYSIOGRAPHY. 



Catalogues Post Free. 



THOMAS D. RUSSELL, Mineralogist 



78, NEWGATE STREET, LONDON. EC; 



BECK'S NEW "BRITISH STUDENTS" MICROSCOPES 



No. 54.- Stand, Tris diaphragm No. 55.— Stand, Iris diaphragm No. 56.— Stand, Iris diaphragm No. 57.— Stand, Iris diaphragm 

 and mahogany case, and mahogany case, and mahogany case, and mahogany case, 



£2 11s. 60. £3 12s. 60. £4 7s. 60. £5 12s. 6d. 



New One-twelfth Inch Oil Immersion Object Glass, N-A i*o £4. 



FuaP olapp^a!^'^ ars R. & J. BECK, Ltd,, 68, Cornhill, London, E.C. 



