TlSLEY & SPILLER having constructed for Mr. Spottiswoode most of the 

 Apparatus used by him in his experiments on Polarized Light, also many of the 

 largest Nicol Prisms yet made, especially the one having a clear field of 3| inches, 

 and admitted to be the most perfect as well as the largest ever made, are prepared 

 to undertake the construction of all kinds of instruments for exhibiting the 

 Effects of Polarization either to large audiences or for Table Demonstration. 

 Table Polariscope for viewing large or small Crystals, Selenite^ £ s. d. 



Designs, &c, and including Goniometer and other accessories, r-18 18 



packed in mahogany case J 



Spottiswoode's Rotating Double-Image Prism Ana- \ o o rt 



lyzer, applied to Table Polariscope . / cJU 



Spottiswoode's arrangement of Spectroscope, fitted to \ q o n 



Table Polariscope J J a U 



Educational Apparatus, for showing the Phenomena of Pola- \ 



rized Light from / ° 12 ° 



Improved Saccharometer, with four tubes, Bunsen's Burner, \ 9() 



Lamp, &c, packed in case / " 



Nicol Prisms. Plates of Quartz, Designs in Selenite. 



Sections of Crystals, &c. &c. 



Pocket Spectroscope, with new adjustable Slit 1 50 



Tisley's Improved Dynamo-Magneto-Electric Ma- 1 21 



chine, for using in the place of a Voltaic Battery J 



De La Rue's Chloride-of-Siiver Batteries. 



TISLEY AND SPILLER, OPTICIANS, 

 172 BR0MPT0N ROAD 



(Three minutes' walk from South Kensington Museum). 



Now ready, royal 8vo, 764 pp., cloth, with over 200 Illustrations, price 34s. 



ELEMENTS OP METALLURGY: 



A Practical Treatise on the Art of extracting Metals from their Ores. 



By J. ARTHUR PHILLIPS, M.Inst.C.E., F.G.S., F.C.S., &c, 



Ancien Eleve de l'Ecole des Mines, Paris. 



" There is certainly no metallurgical treatise in the language calculated to prove 

 of such general utility to the Student seeking sound practical information .... 

 The value of the book is almost inestimable." — Mining Journal. 



" The work possesses intrinsic merits of the highest degree." — Westminster 

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London : Charles Griffin and Company, 10 Stationers' Hall Court. 



The Annals and Magazine of Natural History. 



Including Zoology, Botany, and Geology. — Monthly, price 2s. 6d. 



Complete sets (in Numbers) may be obtained at the following prices : — 



The First Series, in 20 volumes, from 1838 to 1847. Price £6. 



The Second Series, in 20 Volumes, from 1848 to 1857. „ «£9. 



The Third Series, from 1858 to 1862, Vols. I. to X. „ £5. 



1863 to 1867, Vols. XI. to XX. „ ^6. 



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[ADVERTISEMJjMffSjioitiinued on 3rd page of Cover. 



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