WORKS BY THE SAME AUTHOR. 



RESPONSE IN THE LIVING AND NON-LIVING. 

 With 117 Illustrations, 8vo., iar. 6d. 1902. 



PLANT RESPONSE: AS A MEANS OF PHYSIO- 

 LOGICAL INVESTIGATION. With 278 Illustra- 

 tions, 8vo., 2 1 j. 1906. 



COMPARATIVE ELECTRO - PHYSIOLOGY: 

 A PHYSICO-PHYSIOLOGICAL STUDY. With 

 406 Illustrations, 8vo., l$s. 1907. 



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