i 



A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE 



" To the solid ground 



BROWNING'S MICROSCOPES. 



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

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

 diameters. Ordinary microscopic objects mounted on the usual shdes 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. 

 By holding the instrument side-ways to the light, dark field illiraunation, 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 d03 17s. 6d. 



New Illustrated Catalogue of Microscopes and Accessory Apparatus ^ with Thirty -five IllustratiotiSj Eight wholg- 

 page Engravings, Seven Stamps. List post free. 



JOHN BROWNING, 



OPTICAL AND PHYSICAL INSTRUMENT MAKER TO H.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 Glasses, &>c., ^^c. ESTABLISHED 100 YEARS. 



