PLATE I. 



'.- 



Phagocytosis by polymorphonuclear leucocytes, a. M. pyogenes, 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. 



