Post-tetanic tremor. (Supplementary note.)

Since the publication of my paper on this subject, my attention has been called to the fact that the phenomenon has been previously noticed by Dr. Sydney Ringer. I regret that I was unacquainted with his paper until after mine had been published. Dr. Ringer states :—”This powerful prolonged faradisation, for one or two minutes, of the sciatic nerve of a cut-off leg of an undrugged frog, causes the limb to remain extended, and if it be held vertically, foot upwards, it falls more slowly than happens after only a momentary stimulation”; and again: “These fibrillary twitchings and this spastic condition can be produced in normal imprisoned muscle.” There can be no doubt that what Dr. Ringer called “fibrilllary twitchings” and I have termed “post-tetanic tremor” are identical phenomena.