BROWNING’S POCKET MICROSCOPE. 
THE NEW POCKET OR FIELD MICROSCOPE, on Firm Folding 
Brass Tripod Stand, with fine Adjustment, i-inch Objective, Large Field Eye- 
piece, Hand-pliers, &c. ; height when set up, io inches; dimensions, packed in 
Morocco Case, 5$ inches long. Price £1 ns. 6 d. 
Or with i-inch and 2-inch Objectives, Stage, Forceps, Stage Plate, and 
Dipping Tube, £2 2 s. 
List of Microscopes sent free. . , . 
New Illustrated Catalogue of Microscopes, with 41 Illustrations, 10 whole 
page Illustrations, sent for Six Stamps. 
JOHN BROWNING, 
Optical and Physical Instrument Maker to H M, Government, The Royal 
Society , The Royal Observatories of Greenwich , Edinburgh, 6*c., &c. 
63, STRAND, LONDON, W.C. 
Factory— SOUTHAMPTON ST., and EXETER ST., LONDON. 
Prize Medal, 1862. Established ioo Years. 
Telescopes, Spectroscopes, Opera Glasses, &c., &c. 
IR/. _A_. CHBFFIHS, 
w ingrater, ptjpitiral aub Scientific graugtesiran, 
9, ESSEX STREET, STRAND, W.C. 
As Engraver to this and other Philosophical Periodicals, Mr. Cheffins begs 
to call attention to the faCfc that he possesses every appliance for the produc- 
tion of Illustrations to the works of Scientific Authors, as well 1 as special 
facilities for the absolutely accurate reproduction of Diagrams, Microscopic 
Objects, &c., by Photography on Wood ; by which process they can be either 
Experienced Draughtsmen provided to attend LeCtures and Demonstrations, 
and to Sketch Mechanical and othe r objects at a few hours’ notice. 
THE CHEMICATTeWS 
Edited by WILLIAM CROOKES, F.R.S., &c, 
Published Weekly, price 4 d. Annual Subscription, £1, payable in advance . 
This Journal is devoted to Scientific and Applied Chemistry, and also 
tends to elucidate new discoveries in Mineralogy, Metallurgy, Mining, Mechanics, Eledt y, 
and the collateral branches of Physical Science. . It also contains an 1 enc jclooced lie l«t jf 
chemical papers published abroad during the previous week, with abstratfts of all suscepnble 
of advantageous abridgment, thus making the two half-yearly volumes, with their copious 
indices, equivalent to an English edition of the Jahresbenchte. 
London : Boy Court, Ludgate Hill, E.C. 
