PLATES. 



I. Illustrative of Sir J. J. Thomson's Paper on Rays of Positive 



Electricity. 

 II. Illustrative of Prof. R. W. Wood and Mr. J. Franck's Paper on 

 the Transformation of a Resonance Spectrum into a Band 

 Spectrum by the Presence of tlelium. 



III. Illustrative of Prof. Wood's Paper on the Destruction of the 



Fluorescence of Iodine and Bromine Vapour by other Gases, 

 and of Mr. J. Franck and Prof. Wood's on the Influence upon 

 the Fluorescence of Iodine and Mercury of Gases with different 

 Affinities for Electrons. 



IV. Illustrative of Prof. A. A. Michelson's Paper on Metallic Colouring 



in Birds and Insects. 

 V. Illustrative of Mr. A. M. Tyndall's Paper on the Discharge from 

 an Electrified Point. 

 VI. Illustrative of Mr. C. V. Raman's Paper on Photographs of Vibration 



Curves. 

 VII. Illustrative of Mr. C. V. Raman's Paper on the Photometric 

 Measurement of the Obliquity Factor of Diffraction. 



