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A WEEKLY ILLUSTRATED JOURNAL OF SCIENXE. 



" To the solid ground 

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



Xo. 15 18, Vol. 59] 



THURSDAY, DECEMBER i, i{ 



[Price Sixpenxe. 



Newspaper at the Ge 



THE "NEWTONIAN" I BROTBTNING'S PLATYSCOPIC LENS. 



TTNTVFRSAT ^PTyNCF T ANTPT?N ^'''*' '-^''Se'' Angles, increased Fleia, and improved Definition 



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 

 figTxred, ^vlth Iris Diaphragm, 

 One Eye-piece; Double Nose- 

 piece. Tw^o Object-glasses. 2 3 ' 

 and 16, adjusted to be In 

 about focus, and the whole 

 packed in polished Mahogany 

 Case. 



£6:8:6 



R. Sl J. BSCK, Ltd. 



68 CORNHILL, LONDON, E.G. 



AN ACHROMATIC COMBINATION, 

 COMBINING THE DEFINITION OF A MICROSCOPE WITH THE 

 PORTABILITY OF A POCKET LENS. 

 " If yon carry a small Platyscopic Pocket Lens (which every observer of 

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



Tht Platyscopic Lens is in\-aluable to botanists, mineralogists, or ento- 

 mologists, as it focuses about three limes 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, zo, and 30 diams. ; the lowest power, haWng the largest 

 field; is the best adapted for general use. 



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



Price o/tlu Platyscopic Lens, mounted in Tortoiseskell, magnifying either 



lo, 15, 20, or 30 diameters, each power, I5s, 



- In nicketised German Silver, each pmver. 17s. 6d. 



Illustrated Description sent free. 



JOHN BROWNING, 63 STRAND.JLONLON, W,C. 



THE TOURIST'S ANERM 



(WHITESIDE-COOKS.) 



For Measuring Altitudes without Calculation. 



Ne-.v Illustrated Price Lists Frke by Post. 



Made only by 



NEGRETTI & ZAMBRA, 



SCIENTIFIC INSTRUMENT MAKERS to THE QUEEN, 



38 HOLBORN VIADUCT, E.G. 



BRANCHES : 45 CORNHILL; 122 REGENT STREET. 



Telephone : Xo. ;;33 HoLLORN. 

 Telegraphic Address: "Xegretti, London." 



