ADVERTISEMENTS. 



Just published, 8vo, cloth, price 1». Cd., 



ELECTRO-CHEMISTRY 



(In which it is demonstrated that there is a Latent Electricity ex- 

 isting in bodies, as well as a Latent Heat; and that those bodies, 

 when deprived of their Latent Electricity, indicate a change in their 

 characteristic properties). 



BY CHARLES CHALMERS, 



Late of Mcrchiston Academy. 



London : JoHif Chuechili,, New Burlington Street ; Maclachlan 

 & Stewaet, Edinburgh ; and G. & K. King, Aberdeen. 



May also be had of the Author, Merchiston Castle Bank, Edinburgh. 



Now ready, in wrapper, price 6d., 



ON THE COMPAEATIVE VALUE OE CEE- 

 TAIN SALTS for Rendering FABRICS NON-INFLAM- 

 ■ MABLE : being the substance read before'the British AssociAiioir, 

 at Aberdeen. By F. Vebsmann, F.C.S., and A. Oppenheim, Ph.D. 



N. Teubnee & Co., 60, Paternoster Eow. 



MINERALOGY AND GEOLOG"^.— Practical 

 Instruction is given in these interesting branches of Science 

 by Mr. TENNANT .Geologist, 149, Strand, W.C. Mr. Tknnant 

 can supply Elementary Collections and Separate Specimens of 

 Shells, Minerals, Rocks, and Fossils ; also. Geological Maps, 

 Models, Diagrams, Hammers, Blowpipes, Acid Bottles, Magnifying 

 Glasses, Glass-top Boxes, and Microscopic Objects ; and all recent 

 Works on Conchology, Chemistry, MineralogyBotany, and Geology. 



Price 7s. 6(7. each, £i is. per dozen, 



THE STEREOSCOPE, 



A Means of Intellectual Amusement. Views in Rome, Italy, and 

 Switzerland. The magnificent New Series of Views, which excited 

 BO much interest at the meeting of the Alpine Club, were exhibited 

 by, and are to be obtained of Messrs. Mueeat & Heath, 43, Picca- 

 dilly, W., near Sackville Street. 



EDUCATIONAL ACHROMATIC MICROSCOPE^ 



Complete at £3 3s. 



n BAKEH, of 243 & 244, HIGH HOLBOUN, 



\Jt from the introduction of Improved Machinery, is now 

 enabled to produce the most Supeeiok Achromatic Miceoscope 

 for Educational Pueposes ever offered to the Public, at the very 

 low price of £'d 3s. They are complete for all general purposes, and 

 have THREE beautifully defining ACHROMATIC OBJECT 

 GLASSES, that are capable of showing all the generally known 

 tests in a way never before attempted with an instrument of that 

 class. Also 



The LARGEST ASSORTMENT IN LONDON of FIRST- 

 CLASS MICROSCOPES always in Stock, at the lowest possible 

 price it is possible to produce first-class Instruments. 



Botanical, Geological, and Entomological Microscopes, at 10». 6i. 

 each. 



OPPOSITE DAY AND MARTIN'S. 



(ESTABLISHED 1765.) 



CARPENTER & WESTLEY'S 



DISSOLVING VIEWS. 



AMUSEMENT AND INSTRUCTION 



BT MEANS OF 

 WITH THE 



CHEOMATEOPE AND DISSOLVING VIEWS, 



AND EVERY POSSIBLE VARIETY OP SLIDERS, 



UfCLUDINS 



COMIC, LEVER, MOVEABLE HACKWORK, AND PLAIN 



ASTRONOMICAL DIAGRAMS, 



VIEWS IN THE HOLY LAND, ETC. 



No. 1 Lantern, with Argand Lamp, in a Box, £2 12«, 6d. ; No. 2 

 ditto, of a larger size, £4 14». 6d. 



A PAIR OF DISSOLVING VIEW LANTERNS, 



No. 2, with Apparatus, £12 6». 



N.B. — The above prices do not include Sliders for the Lanterns, 

 so that when an order is given it wiU be better for the purch.aser to 

 specify the amount to be expended. A good assortment of Sliders 

 for Dissolving Views may be obtained for £20 or £30, 



LISTS OF SLIDERS AND PRICES FOKW^ARDED UPON 

 APPLICATION. 



CARPENTER AND WESTLEY, 

 OPTICIANS, 



24, Regent Street,Waterloo Place, London, S.W. 



