WORKS BY THE SAME AUTHOR 



RESPONSE IN THE LIVING AND NON- 

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



1902. 



PLANT RESPONSE; as a means of Physio- 

 logical Investigations. With 278 Illustrations. 

 8vo. 21s. 1906. 



LONGMANS, GREEN & CO., 39 Paternoster Row, London, 

 New York, Bombay, and Calcutta 



