76 ENGLISH MEN OF SCIENCE. [CHAP. 



learning were few ; they have built up fortunes 

 by perseverance and intelligence, and at the same 

 time have distinguished themselves as original 

 investigators in non-remunerative branches of 

 science. There are other scientific men who 

 possess what is sometimes called quiet energy ; 

 their vital engine is powerful, but the steam 

 is rarely turned fully on. Again, there are 

 others who have fine intellects, without much 

 energy ; but these latter classes are quite in 

 the minority. The typical man of science has 

 been at full work from boyhood to old age, 

 and has exuberant spirits and love of adventure 

 in his short holidays, when the engine of his life 

 runs free temporarily detached from its laborious 

 tasks. 



"We must be on our guard against estimating 

 a man's energy too strictly by the work he accom- 

 plishes, because it makes great difference whether 

 he loves his work or not. A man with no interest 

 is rapidly fagged. Prisoners are well nourished 

 and cared for, but they cannot perform the task 

 of an ill-fed and ill-housed labourer. Whenever 

 they are forced to do more than their usual small 



