PREFACE XI 



by a consistent and logical interpretation. This interpre- 

 tation may possibly be subject to modification, but it will 

 serve until something better has been suggested. The facts 

 on which the theoretical interpretation is based are, how- 

 ever, irrefutable. 



I conclude with an extract from the preface of my 

 * Comparative Electro-Physiology ' (1907) that by the new 

 methods employed not only 



a deeper perception of unity (of physiological mechanism of plant 

 and animal) has been made available, but also many regions of 

 inquiry have been opened out which had at one time been regarded 

 as beyond the scope of experimental exploration. 



I take this opportunity to express once more to my as- 

 sistants and scholars my thanks for the most efficient help 

 rendered in these difficult and prolonged investigations. 



J. C. BosE. 



BosE Research Institute, Calcutta, 

 May 1929. 



