S. C. BROOKS 



181 



120 r 



100 



80 - 



o 



60 



pu 



40 



20 - 



10 15 



Radiation 



20 



25min. 



Fig. 2. Courses of the process of photoinactivation of eight samples of com- 

 plement. Curves are drawn to show four characteristic examples. The ordi- 

 nates represent efficiency in per cent of that of ururadiated complement, and the 

 abscissae represent time of exposure to light in minutes. 



study of a larger number of sera, yet those here presented will serve 

 to demonstrate two facts; first, that the primary photoreaction is 

 monomolecular, and second, that upon this primary monomolecular 

 reaction there are superimposed accessory processes which serve to 

 increase or decrease the hemolytic power of the serum. 



