05.(^-2- 



iC^^l^ 



A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



*' To the solid ground 

 Of Nature trusts the mind which builds for aye^ — Wordsworth. 



THE "NEWTONIAN" .. 



UNIVERSAL SCIENCE LANTERN 



Complete for Slides. Microscopic Objects, and Spectra. 



Price £18. 



For Lecturers on Light, Colour, and Colour Photography, &c. 



Sole Makers: NEWTON & CO., 3 FLEET STREET, LONDON. 



BROWNING'S PliATYSCOPIC LENS. 



With Larger Angles, Increased Field, and Improved Definition 



of 



iily. 



, magnifying 



ng the largest 



ishell Frames. 



NEW 



MICROSCOPE 



THE 



"BRITISH STUDENTS." 



Microscope Stand No. 55. as 

 agured, with Iris Diaphragm, 

 One Eye-piece; Double Nose- 

 piece, Two Object-glasses, 2/3" 

 ind 1,6", adjusted to be in 

 ibout focus, and the w^hole 

 packed in polished Mahogany 

 i^ase, 



£6:8:6 



68 CORNHILL, LONDON, E.C- 



Engraved Real size. 



AN ACHROMATIC COMBINATION, 



COMBINING THE DEFINITION OF A MICROSCOPE WITH THE 

 PORTABILITY OF A POCKET LENS. 

 " If you carry a small Platyscopic Pocket Lens (which every ob: 

 Nature ought to do).*'— Grant Allen in Knowledge. 



The Platyscopic Lens is invaluable to botanists, mineralogists, 

 mologi'^ts, as it focuses about three times as far from the objecl 

 Coddington Lenses. This allows opaque objects to be examined ea: 



The Platyscopic Lens is made of four degrees of po 

 respectively lo, 15, 20, and 30 diams. ; the lowest power, h 

 field, is the best adapted for general use. 



The Lenses are set in Ebonite Cells, and mounted in Tort 



Price of the Platyscopic Lens, vwunted in Tortoisesliell, magnifying either 



10, 15, 20, or -^,0 diameters, each f>ozver, 1 5S. 



In nickelised German Silver, each poiver, 17s. 6d. 



Illustrated Description sent free. 



JOHN BROWN ING. 63 STRAND. LONDON. W.C. 



NEGRETTI & ZAMBRA'S 



NEW YEAR'S GIFTS, 



Useful & Ornamental. 

 BAROMETERS 



Domestic Use and for Scientific 

 Observations. 



THERMOMETERS 



For all Purposes. 



Opera and Field Glasses, 



Etc., Etc. 



•■ .S/-ec!nl" Illustrated Price List of Instrtt- 



NECRETTi7zAMBRA, 



Scientific Instfument l^^ahers to Her Majesty the Queen A Royaf Family. 

 Obseruatoties Kewand Greenwich, & British & Foreign Governments, 



38 HOLBORN VIADUCT. 



45 Cornhill, and 122 Regent Street, Loudon. 



