Nature . R. Sc J. BECK, Lta., 68 CORNHILL, LONDON, THE MINIATURE SPECTROSCOPE. This instrument will show many of Fraunhofers lines, thebright lines of the metals and gases, and the absorption bands incoloured gases, crystals, or liquids. Price, with Plain Slit, £\ 2s. ; ditto, with Adjustable Slit inMorocco Case, £i 14J. ; ditto, with Achromatic Lens, &c.,in Morocco Case, £2 6s. Illustrated Catalogue of Spectroscopes, Post Free. JOHN BROlVN I N G, MANUFACTURING OPTICIAN, 63 STRAND, LONDON, THE TOURISTS ANEROID. (WHITESIDE-COOKS.)

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