38 



the galvanic current. Tliis appeared not to be (lie case: all of tliem 

 ntioved towards Ihe anode, their charge was conseqnently negative. 

 Through the addition of acid we managed to change their charges: 

 when the pH was made less than 4.8, they moved towards the 

 cathode. 



In the body, where pH is always greater than 4.8, they will 

 always be moved by the current towards the anode. This, then, 

 does not afford an explanation of the various l»ehavionr of the 

 different kinds of blood-corpuscles in the case of exudation. However, 

 we need not, on that account, exclude the possibility of the exudation 

 of the polynuclear leukocytes being caused by a potential difference, 

 as besides a potential difference other factors come into play, which 

 may cause or prevent emigration, i.a. the surface-properties with 

 regard to the capillary wall, and the ameboid mobility. Hence the 

 passive cataphoresis becomes complicated on account of these surface- 

 actions. These actions will vary the effect of the cataphoresis in 

 different cells in accordance with their composition; even in the 

 absence of emigration, the cataphoretic effect even on red blood- 

 corpuscles will reveal itself in the considerable accumulation of 

 blood-elements in the abdominal vessels. 



Now I have tried to demonstrate potential differences between 

 two fluids differing only in the H-ion concentration. To this end we 

 made nse of a so-called "öikette". I succeeded in demonstrating with 

 henzaldehyd and bejizylalcohol as oil phase, potential differences between 

 fluids with a pH of 7.2 and 7.6. When adding lecithin or a mixture 

 of lecithin and cholesterol to the oil phase, the potential difference 

 was considerably greater. An addition of cholesterol alone, however 

 caused the potential difference to disappear altogetliei'. 



These experiments have proved it to be very probable, that ^Aro^^^A 

 the difference in pH there is also a difference in potential between 

 the circulating blood and the exudation. Preliminary experiments 

 justified the same conclusion. 



With non-polarisable electrodes we found that under normal con- 

 ditions the blood is positive (howevei- slightly) relative to the abdomen, 

 while after the injection of a fluid into the abdomen, a reverse 

 potential difference manifests itself. These experiments, however, 

 will have to be prosecuted further. 



Since we have seen that the bloodcorpuscles may be moved by 

 electromotive forces, we are justified in assuming that under the 

 influence of the difference in acidity between the blood and the 

 exudation, which causes a potential difference, the polynuclear 

 leukocytes are moved towards the exudation. The anomalous be- 



