As an illustration of the action upon organic matter in solution I take a small quantity of dye, mix it with water, and placing the connected iron electrodes in the mixture, the dye in solution separates into flocculent particles.

A channel is kept at the bottom of the electrodes for the silt to collect, with a culvert at side to flush it into, so as to prevent any block occurring; the advantage of this is obvious.

One day I got hold of both electrodes of this coil, and it clinched my hands on them so that I could not let go!

I next tried the effect of electrolytic action when iron salts were present, but did not think of using iron electrodes until after trying aluminum.