CYANOGEN SOAP: for removing all kinds of Photographic Stains. Beware of purchasing spurious and worthless imitations of this valuable detergent. The Genuine is made only by the Inventor, and is secured with a Red Label bearing this Signature and Address, RICHARD W. THOMAS, CHEMIST, 10. PALL MALL, Manufacturer of Pure Photographic Chemicals: and may be procured of all respectable Chemists, in Pots at 1s., 2s., and 3s. 6d. each. through MESSRS. EDWARDS, 67. St. Paul's Churchyard; and MESSRS. BARCLAY & CO., 95. Farringdon Street, Wholesale Agents.
Just published, price 1s.
THE STEREOSCOPE,
Considered in relation to the Philosophy of Binocular Vision. An Essay, by C. MANSFIELD INGLEBY, M.A., of Trinity College, Cambridge.
London: WALTON & MABERLEY, Upper Gower Street, and Ivy Lane, Paternoster Row. Cambridge: J. DEIGHTON.
Also, by the same author, price 1s.,
REMARKS on some of Sir William Hamilton's Notes on the Works of Dr. Thomas Reid.
"Nothing in my opinion can be more cogent than your refutation of M. Jobert."—Sir W. Hamilton.
London: JOHN W. PARKER, West Strand. Cambridge: E. JOHNSON. Birmingham: H. C. LANGBRIDGE.