382 GREAT MEN OF SCIENCE 



years old. He was of a simple, kindly and modest nature. 

 Only when it was a matter of self-sacrifice was he to be found 

 in the front ranks; when it was a matter of gaining rewards, 

 he was in the background, even when he was the person most 

 concerned, as we see in the most astonishing manner in his 

 writings. He loved music and his violin, as Galileo his lute; 

 he was very fond of his family and as extremely modest and 

 thankful for the smallest service as Kepler; the Alps were 

 his beloved place of recreation as with Tyndall; in his work 

 we find the thoroughness of Stefan and Boltzmann. 



