A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE 



" To the solid ^riyutid 

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



No. 502, Vol. 20] 



THURSDAY, JUNE 12, 1879 



[Price Sixpence 



Registered as a Newspaper at the General P.jst Ofrice.] 



[All Rights are Reserveri. 



BROWNING'S MICROSCOPES. 



BROWNING'S NEW MINIATURE MICROSCOPE, the exact size of the engraving, may be carried in the 

 waistcoat pocltet. It has two powers, both achromatic, one magnifying fifteen, and the other thirty-five 

 diameters. Ordinary microscopic objects mounted on the usual slides may be viewed by its aid. Opaque 

 objects, when held in the forceps, are illuminated by a Lieberkulm, which is attached to the higher power. 



PBy holding the instrument side-ways to the light, dark field illumination, similar to that given by Wenham's 

 Parabola, may be obtained. 



Price of the Instrument complete, made in solid Nickel Silver, fitted in Morocco case, is £3 17s. 6d. 



New Illustrated Catalogue of Microscopes and Accessory Apparatus, with Thirty-five Illustrations, Eight whole- 

 page Engravings, Seven Stamps. List post free. 



JOHN BROWNING, 



OPTICAL AND PHYSICAL INSTRUMENT MAKER TO II.M. GOVERNMENT, THE ROYAL SOCIETY, 

 THE ROYAL OBSERVATORIES OF GREENWICH AND EDINBURGH, &C., &c. 



6 3, STRAND, W.C, LONDON. 



FACTORY— SOUTHAMPTON STREET and EXETER STREET, LONDON. 

 PRIZE MEDAL, 1862. Telescopes, Spectroscopes, Opera Classes, Sr'C, &'C. ESTABLISHED loo YEARS. 



