'^ 1 



5-^ 



A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



" To the solid ground 

 Of Nature trusts the mind which builds for aye." — WoRDSWORl H. 



THE "NEWTONIAN" 



JUNIVERSAL 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. 



NEW 



MICROSCOPE 



THE 



"BRITISH STUDENTS." 



Microscope Stand No. 55. as 

 figured, -with Iris Diaphragm, 

 One Bye-piece; Double Nose- 

 piece, Twro Object-glasses, 2/3" 

 and 16', adjusted to be in 

 about focus, and the whole 

 packed in polished Mahogany 

 Case, 



£6:8:6 



i^. <& J. seck:, x^td., 



68 CORNHILL, LONDON, E.G. 



BROWNING'S PLATYSCOPIC LENS. 



With Larger Angles, Increased Field, and Improved Definition 



AN ACHROMATIC COMBINATION, 



COMBINING THE DEFINITION OF A MICROSCOPE WITH THE 

 PORTABILITY OF A POCKET LENS. 

 " If you carry a small Platyscopic Poclcet Lens (which every observer of 

 Nature ought to do)." — Grant Allen in Kncnvledge. 



The Platyscopic Lens is invaluable to botanists, mineralogists, or ento- 

 mologists, as it focuses about three times as far from the_ object as the 

 Coddington Lenses. This allows opaque objects to be examined easily. 



The Platyscopic Lens is made of four degrees of power, magnifying 

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

 field, is the best adapted for general use. 



The Lenses are set in Ebonite Cells, and mounted in Tortoiseshell Frames. 



Price of the Platyscopk Lens, mounted in Tortoiseshell, magnifying either 



10 \s 20 or -^o diaiiteters, eacit /lO^ver, 15s. 



/« nickelised German Silver, each /■oioer, 17s. 6d. 



Illustrated Description sent free. 



JOHN BROWNING. 63 STRAND^ LONDON, W.C. 

 CH:ie.iSTivcA.s ^reseivts, 



NEGRETTI &. ZAMBRA'S 



SELF-RECOKDING 



METEOROLOGICAL INSTRUMENTS. 



THE THERMOGRAPH, for Outdo 



Observatii 



Thi~ Instru- 

 i mounted 

 in a Japanned 

 Metal Case with 

 Glass Front, and 

 gives continuous 

 records on Chartfv 



Accurate The rmometeis for all nn rposes. 



"Special" Illustrated Price List of Instruments, 

 suitable for Presents, free by post. 



NEGRETTI & ZAWIBRA, 

 38 HOLBORN VIADUCT, E.C. 



ranches: 45 CORNHILL, and 122 REGENT STREET, London. 



