1293 
the suspensions were brougnt into contact with coal for '/, hour 
at 37°, and the preparations were made. | 
This result is indeed interesting, for we find that when by the 
application of a strongly byperisotonic NaCl-sol. (1.1 °/,) the phago- 
cytosis has been reduced by 50°/, (from 28°/, to 15,5 °/,) a NaCl- 
solution, isosmotic with the former, in which, however, part of the 
NaCl has been replaced by propionate, promotes phagocytosis to a 
considerable extent (to 35.7 °/,). 
A similar result was obtained with lencoeytes which had been 
left in serum containing citrate of Na during one night, and which 
had consequently lost part of their phagoeytarian power. 
After the results obtained with the propionate it might be expected 
that also the butyrate and the formate would give the same results. 
This was indeed the case. 
We subjoin a table, showing the results obtained with butyrate. 
This table shows that Na-butyrate in a dilution of 1:1000 has 
TABLE IV. 
Effect of butyrate of Na on phagocytosis. The 
NaCl-solutions containing butyrate have acted upon 
the leucocytes for half an hour at room-temperature; 
then they were brought into contact with carbon 
for half an hour. 
NaCl-solution 0.995 Percentage of 
leucocytes having 
4. | taken up carbon 
132 
as — 0; 
fig X 100 = 29.3% 
nothing | 
132 
jeg 100=27 , 
130 
Na butyrate 1: 100 zag ~~ 100 = 29 “a 
we Dn) EX 100 = 28.8, 
se Sie loan 4 SEX 100 = 38.1, 
, 135000 | Wyns, 
- 1 : 25000 20 X 100 = 30.7, 
