Page:Philosophical Transactions of the Royal Society A - Volume 184.djvu/345

Rh The next solutions were chosen to show the motion of the acid radicles, and potassium chloride and potassium permanganate were taken. The junction in this case, depending on the acid radicles, should, if its motion really shows the course of the ions, travel against the current. Such was found to be the case. The solutions had a strength of about .046 grm. equivalent per litre. A downward current from chloride to permanganate thus gives an upward velocity to the junction of 0.110 centim. per minute.

The downward velocity of the junction is thus 0.119 centim. per minute.

The mean of the two is therefore 0.115 centim. per minute.

The potential gradient is 3.36, which makes the velocity for unit gradient

As the red permanganate disappears its place must be taken by chlorine, and hence this ought to give an indication of the velocity of the chlorine ion. For this gives

Solutions of one-tenth this strength were then set up (.0046 grm. equivalent per litre).