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introduced in solutions of 0.9 " „ sod. eld. A more detailed accouni 

 of the results of these investigations will follow later. 



We also made a number of experiments to lest the influence of 

 other media on the phagocytarian power, e.g. with ureum, ckinine, 

 argentum colloidale, heterogenous scrum, etc-., the results of which 

 will appear in a subsequent paper. 



Summary. 



The following are the principal conclusions derived from the above 

 described experiments. 



1. The action exercised by various media on the phagoeyterian 

 power of white corpuscles, can be accurately determined by counting 

 I he percentage of cells which have taken up particles of carbon. 



2. The addition of water to the inherent medium of the phagocytes 

 i.e. f<> their men serum, nets injuriously mi the phagocytarian power. 



Even a decrease in tin' osmotic concentration us may daily occur 

 in a normal individual, causes a perceptible decline in the phago- 

 cytarian power. 



So, it was shown in one of the experiments that, whilst in normal 



undiluted serum 37 °/„ of the leucocytes had taken up carbon, in 



serum which had been diluted with 20 "/„ of water the amount of 



cells containing carbon was only 32 °/ : this corresponds to a decline 



37 —32 

 in the phagocytosis of — — — X 100 = 13 - 5 %>• 



By the addition of 50 °/ water, the percentage of phagocytes 

 containing carbon fell to 21 u / ; thus in this case a decrease of 



phagocytosis of -— X 100 = 43 %. 



By addition of 140 and of 200 °/ water, the percentage of the 

 carbon-containing leucocytes was lowered to nil, — in other words the 

 phagocytarian power had been suspended; but only temporarily , for 



3. by replacing the cells damaged by the addition of water, into 

 their own serum, the phagocytarian power is entirely or partially 

 restored. 



So the recovery was complete, when the serum had been diluted 

 with 20 7„ or 50 % of water, and only partial when 70 tot 100 % 

 water had been added. Even when it had been diluted with 200 °/ , 



