WORKS BY THE SAME AUTHOR. 



RESPONSE IN THE LIVING AND NON- 

 LIVING. With 117 Illustrations. 8vo. 10s. 6d. 



1902. 



ELECTRO-PHYSIOLOGY OF PLANTS. 



(To be published shortly.) 



LONGMAN'S, GREEN, & CO., 39 Paternoster Row, London, 

 New York and Bombay, 



