Anatomical Diagnosis: 



I'arked emaciation, Staphylococcus 

 bronchopneumonia, multiple abscess in bodj'' 

 wall, heart, kidneys and spleen* acute 

 nephritis, staphylococcus cystitis. Staph . 

 aureus in pure culture obtained from heart 

 blood, kidneys, spleen and urine. 



The variations in the opsonic index for Staph, aureus 

 in this experiment are in agreement with the results published 

 by Wright (23) and Neufeld (24). Under the stimulation of sub- 

 lethal inoculation there is an increase in phagocytic activity 

 but as soon as the lethal dose is given there is a sharp de- 

 cline wnich often forces the index below the normal. One es- 

 pecially interesting feature of the opsonic index for staphylS- 

 coccus in this experiment is that on December 7th the index 

 was somewhat lower than it was at the time the aniraal died. 

 Although phagocytosis is regarded as the chief defensive mechan- 



(21) 



