

PRESIDENTIAL ADDRESSES. 529 



addition to the solar system since the discovery of 

 the satellites to Mars in 1877." To all of us it is 

 most interesting that during this year, when we 

 are all sympathizing with the University of Padua 

 in its celebration of the third centenary of its 

 acquisition of Galileo as a Professor, we have first 

 gained the knowledge of a fifth satellite in addition 

 to the four discovered by Galileo. 



EXTRACT FROM ADDRESS OF NOVEMBER 30, 

 1893. 



Not the least important of the scientific events 

 of the year is the publication, in the original 

 German and in an English translation by Professor 

 D. E. Jones, of a collection of Hertz's papers 

 describing the researches by which he was led up 

 to the experimental demonstration of magnetic 

 waves. For this work the Rumford Medal of the 

 Royal Society was delivered to Professor Hertz 

 three years ago by my predecessor, Sir George 

 Stokes. To fully appreciate the book now given 

 to the world, we must carry our minds back to the 

 early days of the Royal Society, when Newton's 

 ideas regarding the forces which he saw to be 



VOL. II MM 



