588 



PHAGOCYTOSIS OF SOLID PARTICLES, in 



The results with chloroform are plotted in Fig. 12. Similar results 

 are obtained with cottonseed oil drops in 70 per cent alcohol or water. 

 Moreover, if a mixture of equal numbers of quartz and carbon particles 

 in water is warmed up with phenol above the critical solution tempera- 

 Number of PaTticles Tree 

 o 



Number of Drops of ChlorofoTm 



Fig. 12. Analogy to selective phagocytosis of carbon in a chloroform- water 

 system. To 2 cc. of a suspension of carbon particles 4.7ju in diameter and quartz 

 particles 4.6m in diameter, chloroform is added 5 drops at a time. After each 

 addition the mixture is shaken vigorously, allowed to stand a few minutes until 

 the chloroform drops have settled to the bottom, and counts made of the num- 

 ber of carbon and quartz particles left. These figures are plotted as ordinates 

 against the number of chloroform drops added as abscissae. Both particles 

 accumulate in the chloroform-water surfaces, the carbon, however, much more 

 rapidly than the quartz. 



ture, on subsequently cooling the mixture, the majority of the carbon 

 is found in the phenol phase and the majority of the quartz in the 

 water phase, as shown by actual counts of the number of particles 

 of each in the two phases, as follows: 



