WALLACE O. PENN 



463 



Lo^ A-x 



K=.I34 



2.0- 



• ^v 4.08 jLi K = .34.8 



3 flours 



Fig. 11. Experiment 6. Repetition of Experiment 5, Fig. 10. See Table VI 

 for comparisons of theoretical and experimental ratios and values of initial K's. 



SUMilARY. 



1. A new quantitative method of measuring phagocytosis of solid 

 particles is described. 



2. A method of calculating the chances of colHsion between leuco- 

 cytes and quartz particles of different sizes is developed. 



3. The speed with which three suspensions of different sized quartz 

 particles should be ingested by leucocytes is predicted from the calcu- 

 lated chances of colKsion, and the prediction is verified experimentally. 



