openins the peritoneal cavity did not occasion any modifica- 

 tion in the normal phagocytic activity a,2;ainst any of the three 

 bacteria tested in this experiment. 



Experiment 6. — For this experiment a large adult guinea 

 pig - No. 16 - weighing 540 grams was inoculated intracardially 

 with 0.5 cc. of a 24 hour broth culture of Staph, aureus on 

 Kovember 30, 1920. The first two days the animal exhibited no 

 symptoms of infection but on the third day staphylococci ap- 

 peared in the blood and during the next 72 hours the guinea pig 

 suffered a phenomenal loss in weight. It died on December 4th, 

 in a state of the most extreme emaciation and weakness. 



Full details of the experiment, together with the routine 

 opsonic readings appear in the subjoined table. 



(23) 



