INTRODUCTION. ix 



when the tale consequently will have lost its point and 

 its warning be rendered needless ; when the days that 

 Carlyle did but see in a vision, when astronomy and 

 natural history should be taught in every school, shall 

 be realised, and the glorious domain of Nature thrown 

 freely open to all comers. All who are of the brother- 

 hood, allied in this common sympathy, will welcome 

 whatever brings nearer this ideal. 



