14 THE QUARTERLY JOURNAL OF SCIENCE TO LECTURERS, SCIENTIFIC CENTLEMEN, AND OTHERS. GASSIOTT'S VACUUM TUBES for showing the Stratification in Electrical Discharges, in every variety, at E. CETTI, 11, Brooke Street, Holborn. N.B.-All kinds of Experimental Glass-blowing and Chemical Apparatus made to order on the Premises. J. SOLOMON, PHOTOGRAPHIC AND OPTICAL WAREHOUSE, 22, RED LION SQ., LONDON. PATENTEE of GRANT'S MAGNESIUM LAMP for burning MAGNESIUM METAL WIRE and RIBBON. Great Reduction in the price of Magnesium, nearly Fifty per Cent. List sent on application. YELLOW NON-ACTINIC MUSLIN for the Dark Room, 33 Inches wide, 4s. per Yard. Illustrated Catalogues given on application. PHOTOGRAPHY IN THREE LESSONS, SIXPENCE. Customers supplied from the largest and best Stock of Photographic Materials in England. ARMISTEAD'S IS MUSTARD, Patronized by the Royal Family, and the Lords of the Admiralty, S Manufactured by a Peculiar Process, ensuring the full flavour and pungency of the Seed.-See the following Testimonials of eminent Chemists: "I have analyzed the GENUINE BROWN MUSTARD' manufactured by Messrs. J. & J. Armistead, and find it free from all impurity, and, as it claims to be, genuine."-GEORGE WILSON, M.D., Professor of Technology, Laboratory of the Industrial Museum, Edinburgh. "I have analyzed ARMISTEAD'S GENUINE BROWN MUSTARD,' and certify that it is genuine."-STEPHENSON MACADAM, Ph. D., Analytical Laboratory, School of Arts, Edinburgh. pure and J. & J. ARMISTEAD, Water Hall Mills, Leeds; & 79, Basinghall Street, E.C. Sold by all Grocers, Tea-dealers, and Druggists. IMPORTANT JOSEPH ANNOUNCEMENT. GILLOTT, METALLIC PEN-MAKER TO THE QUEEN, VICTORIA WORKS, BIRMINGHAM. 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