THE CHEMISTRY OF LIGHT PRODUCTION 113 



the luciferin-luciferase reaction really represents a cata- 

 lytic oxidation of similar nature. As Dubois (1914 a) 

 expresses it, we are dealing in luminous organisms with 

 "1° une luminescence; 2° une chemiluminescence ; 3° une 

 oxyluminescence ; 4° une zymoluminescence. 



"Ou_§^ I'on bien admettre que les zymases sont encore 

 quelque chose de vivant, une Biozymooxy luminescence. " 

 Perhaps it is not really necessary to admit that the en- 

 zymes are living in order that we may adequately visualize 

 the nature of the photogenic process. 



In the next chapter the properties 6f the three principal 

 substances, luciferin, oxyluciferin and luciferase, will be 

 studied more carefully. 



