530 | The Phagocytosis of Red Blood-Cells. 
Experiment 16.—The following mixtures— 
A. B. C. 
Inactivated serum of normal dove... 0:1 cc. O-lc.e; 0-1 ce. 
Red blood-cells of guinea-pig ...... 0025 cc. 0:005 ce. O:00Ratem 
were kept (with constant shaking) at 30° C. for 24 hours. To a loopful of 
A, B, and C respectively, a few leucocytes from the dove were added; at the 
end of one hour none of the leucocytes added to A contained red blood-cells, 
while 15 and 20 per cent. respectively of those added to B and C contained 
red blood-cells. A, B, and C were now centrifugalised, and to the cell free 
sera fresh red blood-cells of the guinea-pig and leucocytes of the dove added 
(D, E, F respectively); at the end of an hour, at 37° C., in D, none of the 
leucocytes contained red blood-cells,in E and F,1 and 20 per cent. respec- 
tively of the leucocytes contained red blood-cells. 
