1904.] Role of Blood Fluids in connection with Phagocytosis. 135 



Experiments on the Opsonic Power of Human Blood in its 

 Relation to the Pneumococcus of Fraenkel. 



Experiment 1. 

 A. 



S. B. D.'s unheated serum 2 vol?. 



S. B. D.'s washed corpuscles 2 ,, 



Suspension of the pneumococcus of Fraenkel 1 vol. 



Phagocytic index (15 P.W.B.C), 16. 

 B. 



S. It. D.'s heated serum 2 Vols. 



S. It. D.'s washed corpuscles 2 



Suspension of Fraenkel's pneumococcus 1 vol. 



Phagocytic index (40 P.W.B.C), M. 



Experiment 2. 



. . ........ A, 



A, E. W.'s unheated serum 2 vols. 



S. It. D.'s washed corpuscles 2 „ 



Suspension of Fraenkel's pneumococcus 1 vol. 



Phagocytic index (23 P.W.B.C), 6. 

 B. 



A. E. W.'s heated serum 2 vols. 



S. It. D.'s washed corpuscles 2 



Suspension of Fraenkel's pneumococcus 1 vol. 



Phagocytic index (40 P.W.B.C), 0-2. 



Experiments on the Opsonic Power of Human Blood in its 

 Relation to the Bacillus of Anthrax. 



Experiment 1. 



A. 



S. B. D.'s unheated serum 3 vols. 



S. B. D.'s washed corpuscles 3 ,, 



Suspension of Bacillus anthracis 1 vol. 



Enumeration was here impossible, but there was everywhere 

 evidence of phagocytosis. In the few cases where the leucocytes had 

 not ingested bacteria, they were found to have extended themselves in 

 a characteristic grasping manner along the bacterial threads (fig. 5). 



vol. lxxiii. l 



