PEO&EESS OF SCIENCE IN THE 

 CENTUKY. 



BOOK ONE. 

 INTRODUCTORY. 



CHAPTEK I. 



The Scientific Mood, 

 the meaning of science. 



Many attempts have been made to define what we 

 mean by ^^ Science." " A higher development of 

 common knowledge" (Spencer) ; " organised common 

 sense " (Huxley) ; ^^ classified and criticised knowl- 

 edge " ; " the universal element in knowledge " ; 

 " an understanding of facts " ; " our correlated ex- 

 perience/' — are among the many suggestions. It 

 will be noted that these definitions, though all some- 

 what vague, suggest two ideas: (a) that science is 

 not something by itself, apart from other knowledge, 

 or confined to any particular order of facts; and 

 (b) that it has none the less a distinctive feature, as 

 expressed by some word like " organised " or ^^ sys- 

 tematised." The fact is that whenever we gather 

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