ond suspension was less, and there was also a greater amount 

 of non-specific absurption of opsonins in the suspension con- 

 taining the larger number of cells. 



Tihe following tabulated results, selected from cases 

 presented earlier in this paper, reveal the difficulty of ob- 

 taining an accurate and dependable measure of the relative 

 phagocytic powers of leucocytic suspension obtained from dif- 

 ferent animals. As in the preceeding experiments the opsonic 

 determinations are based upon a count of the bacteria taken up 

 by 50 neutrophile leucocjrtes . The phagocytic m.ixtures were 

 made by incubating the normal and experimental leucocytes 

 separately with both the control and experimental sera. The 

 kind of bacteria used and other conditions of the experiment 

 are explained in the following table: 



*Nc. of bacteria in 50 neutrophile leucocytes, 

 ♦♦Animal providing serum. 



(53) 



