136 LIFE AND WORK OF SIR JAGADIS C. BOSE 



derived from the environment and sensitive to its changes. 

 In both cases depletion of energy by isolation stops activity. 

 Yet from this state of standstill, growth can be renewed 

 by fresh stimulus from outside. Even an organ in which 

 growth has normally ended may be started anew, as demon- 

 strated by Bose, by electrical or other appropriate stimuli. 

 So here is, at any rate, some support for the ever-recurring 

 dream of rejuvenescence. And even if this be no more, at 

 least for the higher species, than a mirage of life, we may 

 at least suggest the possible fruitfulness of discussion, 

 perhaps even collaboration, between say one of Bose's 

 experimental assistants and one of the young neurologists 

 before whom the war has so strongly brought problems 

 of this nature. 



