12 
leucocytes to the action of fatty acid and of sulphurie acid-solutions 
containing the same percentage of ions of H, and determined subse- 
quently its phagocytarian power. 
The table on p. 1290 will need no further explanation. 
It follows from this series of experiments that the noxious effect 
of aqueous sulphuric acid- and propionic acid-solutions manifests itself 
at the same concentration of ions of H. 
This renders it in a high degree probable that the noxious effect 
of a strongly diluted solution of propionic-acid must be attributed 
to the action of ions of H. 
If this view was the correct one, if it was not the anion of pro- 
pionic acid, but the ion of H which had to be reckoned with, it 
might be expected that the propionate of sodium, in the correspond- 
ing dilution, would have no bad effect. 
This was indeed not the case, as appears from the following table. 
TABLE II. 
Effect of Na-propionate on phagocytosis. The propionate acts upon the 
leucocytes during half an hour. The leucocytes are brought into contact 
with carbon during half an hour at 37-. 
NaCl-sol. 0.9% in which | Number of | Number of leuco-; Perc, 
leucocytes cytes having | of 
has been dissolved : examined taken up carbon phagocytosis 
a 
| MGB et 373 48.50/ 
nothing | akg 
323 163 50.4 » 
Na-propionate 1: 100 | 
(i.e. 1 gr. propionate dis- 923 | 535 57.9» 
solved in 100 ccm. NaCl) 
Na-propionate 1 : 250 549 332 60.4 » 
» 1 : 1000 781 460 58.6 » 
412 © 247 59.9 » 
» 1 : 5000 
344 83 24.1»? 
» 1 : 25000 891 437 49 >» 
» 1 : 100.000} - 633 321 50:7 3 
