﻿PLATES. 

 I.-IV. Illustrative of Mr. W. B. Croft's Paper on Diffraction. 



V. Illustrative of Mr. Carl Barus's Paper on Coloured Cloudy Con- 

 densation. 



VI. Illustrative of Mr. F. L. 0. Wadsworth's Paper on an Improved 

 Form of Littrow Spectroscope. 



VII. Illustrative of Prof. John Trowbridge's Paper on Electrical 

 Resonance and Electrical Interference. 



VITI.-X. Illustrative of Mr. F. L. 0. Wadsworth's Paper on Fixed- 

 Arm Spectroscopes. 



XI. Illustrative of Mr. Baly and Prof. Ramsay's Paper on the Relations 

 of Pressure, Volume, and Temperature of Rarefied Gases. 



XII. Illustrative of Mr. C. E. St. John's Paper on Wave-Lengths of 

 Electricity on Iron Wires. 



XIII. Illustrative of Mr. F. L. G. Wadsworth's Paper on a New 

 Method of Magnetizing and Astaticizing Galvanometer-Needles. 



XIV. Illustrative of Mr. F. L. 0. Wadsworth's Paper on a very 

 Sensitive Form of Thomson Galvanometer. 



XV. & XVI. Illustrative of Mr. J. B. Henderson's Paper on the Effects 

 of Magnetic Fields on the Electric Conductivity of Bismuth. 



