390 



INFLUENCE OF THE DILUTION OF SERUM. 



llie influence of time of incubation. — In the following the 

 pipettes were incubated for periods of 10, 15, and 20 minutes at 

 37°. The dilutions were made with 0-85 % saline. It will be 

 noted that, although the serum had not been previously treated 

 with sodium chloride, the curves are, to a certain extent, of the 

 nature of those obtained with salted serum. It would appear 

 that, upon the day on which this experiment was made, there was 

 a larger than usual amount of saline matter in the blood. 



Fig. 4. — Duration of phagocytosis. 

 It will have been noticed that, as the serum is diluted, the 

 curve may or may not rise above unity. Take curves Nos. 2 



