PLATE I. 



" 



Phagocytosis by polymorphonuclear leucocytes, a. M. pyogewes, 

 var. aureus. b. B. tuberculosis. 



c. M. pyogenes, var. aureus in pus. Smear 

 preparation, x 1000. 



d. M. pyogenes, var. 

 aureus. Gelatin stab- 

 culture, four days old. 



