WILLIAM E. AMBERSON 



537 



decay curve, and cannot therefore be considered verified by it, the 

 assumptions are at least the most plausible that can be made at 

 present. The Cypridina luminescence is not, however, a phosphor- 

 escence but an oxyluminescence. 



In the present work I adopted as a working hypothesis this assump- 

 tion that light intensity is a direct measure of reaction velocity. My 



as 



2,4 



s 



0.8 



40 



80 



120 



Time 



Fig. 1. Decay curve of luminescence in Cypridina. A. Abscissae represent time 

 in millimeters along the film; ordinates, intensity of luminescence, B. abscissae 

 represent time; ordinates, logarithm of intensity. 



experimental results give a consistent picture when interpreted in 

 terms of such an assumption, and greatly increase the probability 

 of its truth, lending, I believe, quantitative support to the hypothesis 

 of Trautz, Data obtained from a large number of photographic 

 records extending over wide differences in concentration of both 



