PLATES. 



I. Illustrative of Mr. C. V. Boys's Paper on the Drawing of Curves by 



their Curvature. 



II. Illustrative of Profs. Dewar and Fleming's Paper on the Electrical 



Resistance of Metals and Alloys at Temperatures approaching the 

 Absolute Zero. 



III. Illustrative of Mr. John Trowbridge's Paper on the Oscillations 

 of Lightning Discharges and of the Aurora Borealis. 



IV.-IX. Illustrative of Dr. Harry C. Jones's Paper on the Dissociation 

 of Compounds in Water as Measured by the Lowering of the 

 Freezing-Point. 



