CONDITIONS OF CHEMICAL CHANGE 669 



chemical laws ; they regarded it moreover as a phenomenon 

 capable of pointing the way to broader generalisations and 

 sounder views on the nature of chemical change. But if the 

 existence of an intermediate compound be postulated, the period 

 of chemical induction is merely a particular manifestation of 

 known laws. 



In a subsequent article, recent work dealing both with the 

 problems raised by the researches of the earlier investigators 

 and with the new issues which have arisen in the investigation 

 of these will be described; the present position of the subject 

 will then be reviewed. 



