46 LIFE AND WORK OF SIR JAGADIS C. BOSE 



from the standpoint of permanent contribution, underlying 

 present superstructure and future alike. Hence, though 

 every science seems and so far is in continual change and 

 this often of style and aspect with each new group and 

 mood of workers its growth has yet a substantial unity. 



In this way appreciation, such as the present, of a 

 notable living worker involves some brief mention of such 

 work of past years as is now fully taken into the general 

 structure, to support later work by successors' ; before we 

 come to the growing edge where he is actively employed. 

 Indeed, lower than these two levels we may sometimes find 

 a third, that of portions of wall with stones long laid, where 

 their worker has been interrupted, and where no one has 

 yet continued his task. 



; In this comparison much of Bose's earlier physical 

 investigation naturally belongs to the first of these cate- 

 gories, that of accepted and established science, now fully 

 incorporated and utilised. His later work, that centering 

 around the Response to Stimulus of the Living and Non- 

 Living, is of the second category : where the builder is 

 conspicuously busy with his assistants on the growing edge 

 of science. To this we shall come in a later chapter ; but 

 there are also elements of his physical researches belonging 

 to the third category those still awaiting continuance, 

 whether by himself or others. For the moment then we may 

 look to the first and last-named of these categories, leaving 

 the second for later treatment. 



From the previous chapter we see how little time for 

 fresh thought or experiment remained after long days of 

 three or four lectures, with usually more hours of apparatus- 

 making, and experiment-preparing, of lecture syllabus- 

 writing, paper-correcting, and so on ; and with evening 

 leisure disturbed too often by the various struggles of 

 academic existence above briefly indicated, and too long 

 fretted also by the struggle of paying off the debt of honour 

 from an income peculiarly modest. It was not until 

 1894, as already mentioned, when reaching his thirty-fifth 



