478 



PHAGOCYTOSIS OF SOLID PARTICLES. II 



% of Cells containing 

 Carbon 



1 1 



3 Hours 



Fig. 5. Curves showing that serum increases phagocytosis of carbon and that 

 its effectiveness in this respect is destroyed by heating to 56°C. for 40 minutes. 



Number of Cells 

 2.0 



10- 



• }io Caibon 

 o Carbon 0.4cc 

 '^ Carbon 1 Occ 



12 3 Hours 



Fig. 6. The number of unclumped cells (x 10* per mm. ^) plotted as ordinates 

 against time in hours as abscissae. Curves show that the cells clump more rapidly 

 in presence of 3.1 and 1.25 X 10* particles of carbon per mm.^ The same effect 

 was observed in two other unpublished experiments in which counts of the cells 

 were made. 



