On the change in the conduction velocity in the nerve during the development of parabiosis

General nervous physiology still takes into account a kind of doctrine of the separation of the basic properties of nerves, according to which one of the properties can be changed without changing the other, such as, for example. destroy conduction while maintaining excitability.

In the development of this doctrine, a very significant role belongs to the small and simple experiment of Grungayen, who studied the stepwise effect of carbon dioxide on the excised frog nerve. Exposing a part of the nerve to the influence of carbon dioxide, Grungagen found that excitability in the anesthetized area dropped markedly, while, upon stimulation of the central end, contractions continued to be obtained at the same current strength.