﻿PLATES. 



I. Illustrative of Messrs. H. T. lizard and D. R. Pye's Paper 0:1 

 Experiments on the Ignition of Gases by Sudden Com- 

 pression. 

 II. Illustrative of Prof. L. V. King's Paper on a Lecture-Room 

 Demonstration of Atomic Models. 

 III. & IV. Illustrative of Prof. Barton and Dr. B:owning's Paper on 

 Vibrational Responders under Compound Forcing. 

 V. Illustrative of Dr. F. H. Newman's Paper on a Sodium- 

 Potassium Vapour Arc Lamp. 

 VI. Illustrative of Dr. J. S. G. Thomas's Paper on the Discharge 

 of Air through Small Orifices, and the Entrainment of Air 

 by the Issuing Jet. 

 VII. Illustrative of Kir. W. N. Bond's Paper on a Wide Angle 



Lens for Cloud Recording. 

 VIII. Illustrative of The Research Staff of the General Electric 

 Company on a Problem in Viscosity. 

 IX. Illustrative of Prof. R. W. Wood's Paper on Polarized Reso- 

 nance Radiation of Mercury Vapour, 



