A WEEKLY ILLUSTRATED JOURNAL OF SCIENXE 



" To the solia ground 

 Of Nature trusts tlie mind which builds for aye." — WORD3WOR.TH 



BROWNING'S 

 MICROSCOPES. 



MICROSCOPE, extra large model, with 

 firm highly-finished stand, rack and fine 

 adjustment to body, large mechanical stage, 

 with rectangular and circular motions, and 

 spring object-clamp, perfectly concentric ad- 

 justable sub-stage for apparatus, graduated 

 drawer tube, large plane and concave mirrors 

 on a double-jointed arm, large size stand 

 condenser, one pair each. A, B, and C eye- 

 pieces, 2-in. objective of 16" angular aperture, 

 I -in. of 25% and j-in. of 100', with an adjust- 

 ment for the thickness of the covering glass. 

 Binocular arrangement and rack and pinion 

 adjustment to the two drawer tubes, for the 

 adaptation of the eye-pieces to the width of 

 the eyes of the observer ; packed in highly- 

 finished Mahogany Cabinet, with box for 

 apparatus. 



PRICE £42 Os. Od. 



PRICE LIST OF MICROSCOPES FREE. 



An Illustrated Catalogue of Mi- 

 croscopes, with 35 Illustrations, 8 

 whole page engravings, post free, 

 7 stamps. 



BROWNING'S new Cheap Series of high- 

 power Objectives, |-in. 80', £2 7s. 6d. ; |-in. 

 9o\ £2 I2s. 6d. ; ^-in. 95', £3 s^. od. 



JOHN BROWNING, 



Optical and Physical Instrument Maker to H.Iif. 

 Goz-ernment, the Royal Society, the Royal Obser- 

 vatories 0/ Greenwich, Edinburgh, <S^r., d-r. 



63, STEAND, W.C, LONDON. 



Factory — Southampton Street and Exeter Street, London. 



Prizb Medal, 1862. Established 100 Years. 



Telescopes, Spittrcsco^'-es, Opera Glass fs, d-r., &^. 



