In order to examine these facts once more on an extensive scale, and at the same time obtain an understanding of the development of the decrement in the narcotized stretch, I have requested _Dr. Lodholz_ to register as many accurate curves as possible in which the positions of the secondary coil of an inductorium are the ordinates indicating the threshold of stimulation at four points of a nerve stretch. Of these points three are situated at prescribed distances from each other in the narcotized or asphyxiated stretch; the fourth is centrally placed. (Figure 24.) As might be expected the result was the same as in former investigations. They show however even more strikingly the abruptness of the disappearance of conductivity simultaneously for the weakest and the strongest stimuli. The curve produced by the centrally placed electrode remains at the same height for a considerable period, then suddenly abruptly declines. Those of the electrodes within the chamber likewise sink, at first slowly, then with increasing rapidity in successive order corresponding to the distance which they are situated from the point of exit of the nerve, so that the curve of the most distant electrode reaches the abscissa first, that of the electrode nearest the muscle in the chamber, last. The experiments demonstrate with complete clearness that in contrast to all those points within the affected stretch, where the conductivity, though already obliterated for weaker stimuli, still exists for stronger, that with stimulation of a point towards the center _above_ the affected stretch, conduction ceases simultaneously for all different strengths of stimuli. This last state at the points within the affected stretch might be ascribed to the diminution of the excitability of this stretch, and the idea entertained that the weak stimuli no longer produce excitation capable of further conduction.