24 THE ADVANCE OF SCIENCE 



identical ; that science cannot make a step 

 forward without, sooner or later, opening 

 up new channels for industry ; and, on 

 the other hand, that every advance of in- 

 dustry facilitates those experimental in- 

 vestigations, upon which the growth of 

 science depends. We may hope that, at 

 last, the weary misunderstanding between 

 the practical men who professed to despise 

 science, and the high and dry philoso- 

 phers who professed to despise practical 

 results, is at an end. 



Nevertheless, that which is true of the 

 infancy of physical science in the Greek 

 world, that which is true of its adoles- 

 cence in the seventeenth and eighteenth 

 centuries, remains true of its riper age in 

 these latter days of the nineteenth cent- 

 ury. The great steps in its progress have 

 been made, are made, and will be made, 

 by men who seek knowledge simply be- 

 cause they crave for it. They have their 

 weaknesses, their follies, their vanities, 



