PLATES. 



I. Illustrative of Dr. Sand's Paper on the Measurement of the 



Potential of the Electrodes in Stationary Liquids. 

 II. Illustrative of Prof. T. R. Lyle's Paper on the Variations of 

 Magnetic Hysteresis with Frequency. 



III. Illustrative of Mr. G. B. Dyke's Paper on the Practical 



Determination of the Mean Spherical Candle-Power of 

 Incandescent and Arc Lamps. 



IV. Illustrative of Dr. Buchanan and Mr. H. W. Malcolm's 



Paper on Experiments with Rotating Viscous Liquids. 

 V. & VI. Illustrative of Mr. W. Duddell's Paper on a High-Frequency 

 Altera ator. 

 VII. Illustrative of Mr. N. R. Campbell's Paper on Radiation 

 from Ordinary Materials. 

 VIII. Illustrative of Miss J. M. W. Slater's Paper on the Excited 

 Activity of Thorium. 

 IX. & X. Illustrative of Profs. E. W. Morley and D. C. Miller's Papers 

 on the Theory of Experiments to detect Aberrations of 

 the Second Degree, and on an Experiment to detect the 

 FitzGerald-Lorentz Effect. 

 XL Illustrative of Prof. J. A. Fleming's Paper on the Appli- 

 cation of the Cymometer to the Determination of the 

 Coefficient of Coupling of Oscillation Transformers. 



ERRATA. 



Page 512, lines 24 & 26, for 137° C. read 139° 0. 

 „ 579, formula (9), for -^- read -p- 



„ 582, lines 19 & 20, for let Reversal of the light take place, the effect 

 read let Reversal of all velocities in the medium take 

 place, one effect 



„ 590, line 5, for diagram read diatom 



