vi TILLEES OF THE GEOUND 



reader not only appreciation of the scientific method 

 of study and spirit of self-sacrifice, but also a 

 desire to emulate the lives of men whose labours 

 have brought the knowledge of Nature to its 

 present position. 



These are the objects of the series of Eeadable 

 Books in Natural Knowledge to which the present 

 volume belongs. Each volume will endeavour to 

 stimulate interest in the studies with which it is 

 concerned and to present natural phenomena and 

 laws broadly and attractively. It is hoped that 

 the books will provide the reading matter urgently 

 required in connection with the science work in 

 schools, and will appeal also to a wide circle of 

 other readers. The series should be of service in 

 directing attention to the nobility of scientific 

 ideals and the ultimate value of results obtained 

 by careful and faithful work. 



