: 



PREFACE 



THE title of this little volume sufficiently ex- 

 plains its contents ; it only remains to add that 

 much of the text has already appeared from time 

 to time in the form of popular articles in various 

 magazines. It has, however, been carefully re- 

 vised and considerably added to in parts where 

 later researches have thrown further light upon 

 the subjects dealt with. 



G. C. FRANKLAND 



NORTHFIELD, WORCESTERSHIRE, 



November ; 1902 



151721 



