ii.] QUALITIES. 95 



From Saturday afternoons to Monday mornings 

 would walk forty to fifty miles [in pursuit of a 

 branch of natural history] . Could work hard at 

 business all day (and a very anxious business), 

 and at evening and night would work hard at 

 [two branches of science]. Found a wonderful 

 relief in science. 



" Father Energetic in travelling ; great energy 

 in business." 



38. "For several years was engaged in full 

 medical practice, and at the same time was a 

 lecturer on ... and engaged in investigations 

 on .... for which the Royal medal was awarded 

 by the Royal Society. 



" Father and Mother Both of active habits." 



39. "In professional life I have often been up 

 three successive nights without distress, but did 

 not like a fourth, if it came. Consider that my 

 limit. In mind Wrote .... [a considerable 

 work] between eleven P.M. and two A.M., after 

 professional hours. All the time that I have 

 devoted to science has been stolen from strictly 



