LIST OF ILLUSTRATIONS. 



Plates 1 to 7. Professor K. PEARSON and Miss A. LEE ou the Vibrations in the 

 Field round a Theoretical Hertzian Oscillator. 



Plates 8 to 12. Messrs. A. SCHUSTER and G. HEMSALECH on the Constitution of the 

 Electric Spark. 



Plates 13 and 14. Messrs. R. THRELFALL and J. A. POLLOCK on a Quartz Thread 

 Gravity Balance. 



Plates 15 to 28. Professor J. A. EWING and Mr. W. ROSENHAIN on the Crystalline 

 Structure of Metals. Bakerian Lecture. 



