HARD WICKE'S SCIENCE-GOSSIP. 



liii 



SIXPENCE MONTHLY. ILLUSTRATED. 



Edited by JEROME K. JEROME and ROBERT BARR. 



CONTRIBUTORS. — Mark Twain, Rudyard Kipling, Bret Harte, J. M. Barrie, Jerome K.Jerome, Hall 

 Caine, James Payn, W. Clark Russell, Andrew Lang, Walter Besant, Conan Doyle, Luke Sharp, E. W. Homung, 

 George R. Sims, I. Zangwill, Eden Phillpotts, F. W. Robinson, Barry Pain, Grant Allen, W. L. Alden, &c. 



ARTISTS. — J. Bernard Partridge, Irving Montagu, A. S. Boyd, Ronald Gray, Dudley Hardy, ' Cynicus,' 

 J. Giilich, Fred Pegram, Hal Hurst, R. Jack, E. M. Jessop, Miss Hammond, J. F. Sullivan, Geo. Hutchinson, 

 H. C. Seppings Wright, Sydney Cowell, &c. 



A Series of Articles is appearing Monthly in THE IDLER, entitled " My First Book." 



Including Walter Besant, James Payn, W. Clark Russell, Grant Allen, Hall Caine, G. R. Sims, Rudyard Kipling, 

 Miss Braddon, J. M. Barrie, Conan Doyle, Rider Haggard, Robert Buchanan, &c. 



A. SERIES © JF POWERFII SHORT STORIES 



By Rudyard Kipling, Conan Doyle, Bret Harte, W. Clark Russell, Robert Barr, W. L. Alden, &c, &c. 



THE IDLERS' CLUB 



By Rev. Dr. Parker, Mrs. Lynn Linton, G. R. Sims, Barry Pain, I. Zangwill, Luke Sharp, Joseph Hatton, 



Eden Phillpotts, Clement Scott, &c, &c. 



London : CHATTO & WINDUS, 214, Piccadilly, W. 



BROWNING'S SPECTROSCOPES. 



The Student's Spectroscope has a prism of extremely dense 

 glass, of very superior workmanship ; the circle is divided, and 

 reads with a vernier to single minutes ; the slit is fixed with a 

 reflecting prism, by means of which two spectra can be shown in 

 the field of view at the same time. The instrument will divide 

 the D line in the Solar Spectrum, or the yellow Sodium lines 

 distinctly. With a slight alteration of the adjustments, the 

 instrument can be used for taking the refractive and dispersive 

 powers of solids or liquids. The Student's Spectroscope is 

 the best instrument for the Laboratory and for all general 

 work in Spectrum Analysis. 



Price, Complete. in Cabinet, 



ILLUSTRATED CATALOGUE OF SPECTROSCOPES, POST FREE. 



JOHN BROWNING, 63, STRANdTlONDON, W.O. 



Gold Medals, Paris, 1878 : 1889. 



JOSEPH CILLOTT S 



Of Highest Quality, and Having 

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