Page:Proceedings of the Royal Society of London Vol 69.djvu/200

186 twenty-four hours, in the case of an ill-nourished cat. I regard this as indicating brief survival of tissue.

Fallacies due to anomalous polarisation require to be tested for and excluded. In my experience this kind of fallacy is liable to occur from a defectively amalgamated zinc, and is eliminated by reamalga- mation.

I have not thought fit to use tetanising currents with tissue, secondary coil, and galvanometer in one circuit, but have always short-circuited the galvanometer during tetanisation (any current in circuit being of course neutralised by compensation), and non-short-circuited the galva- nometer immediately after tetanisation. The time interval in this proceeding has been about 1 second, and upon occasion ^th second. I have not attempted to ascertain what the electrical state may have been during this transfer-time.

The following experiment is given to illustrate the fallacy of the electrodes and its correction ; the explanation ottered of that fallacy is only tentative.

Preliminary Experiment to illustrate the Fallacy of the Electrode* and its Removal.

A pair of zinc rods, 1> A, in a U-tube, connected with a key-board coil, compensator, and galvanometer in the usual way.