558 KINETICS OF BIOLUMINESCENT REACTION. II 



of luciferin concentration results only in a decrease in the value of 

 the ^'-intercept, Log Ak, the two straight line plottings for two 

 different concentrations being parallel. 



7. The temperature coefficient is high, being about 4.5 for the 

 15-25° interval, and 3.0 for the 25-35° interval. 



In conclusion I wish to express my sincere thanks to Dr. E. Newton 

 Harvey, of Princeton University, whose interest in this study has 

 made its completion possible. I also wish to express my deep obli- 

 gation for valuable assistance upon the physical aspects of the 

 problem to Dr. Edward P. Hyde, Director of the Nela Research 

 Laboratories, and to members of his staff, especially Dr. W. E. For- 

 sythe. Dr. A. G. Worthing, Dr. E. Q. Adams, and Mr. M. Luckiesh, 

 as well as to Dr. Charles Brush, who was kind enough to place a 

 fellowship in the Nela Research Laboratories at my disposal for the 

 summer months of 1921. The experimental methods were developed 

 at that laboratory; the major part of the observations have been 

 made at Princeton University. 



