PREFACE. 



on the recent progress of science ; in par- 

 ticular, those of Prof. DOLBEAR, the Rev. 

 Dr. DALLINGER, and Dr. SCHOFIELD : to 

 the latter, not only for much valuable infor- 

 mation, but also for permission to make use 

 of the illustration in his excellent treatise 

 on "The Unconscious Mind." 



BlRKENHEAD, 



April, 1902. 



