We have already seen that the wave of excitation meets with a decrement of its intensity in the narcotized stretch, which increases in strength as the irritability diminishes. If the value of the threshold is learned by stimulating the nerve at the electrodes centrally placed to the chamber with minimal stimuli, it would necessarily follow that this weak stimulus would bring about a corresponding weak excitation of the individual fibers and the wave of excitation already in the beginning of narcosis would be obliterated, for it would meet with a decrement, the result of the reduction in the irritability. A wave of excitation of minimal strength could under these conditions no longer reach the muscle, even in the beginning of narcosis. In spite of this the excitation, even when produced with threshold stimuli, passes through for a long time, even when the irritability in the chamber is greatly reduced, as shown by testing with the electrodes within the chamber. This is not consistent with the assumption that a threshold stimulus brings about the minimal excitation, even in the individual nerve fiber. But further: with a definite decrease of irritability of the narcotized stretch the capability of conductivity disappears, and indeed simultaneously for the weakest as well as the strongest stimuli. If it is assumed that weak stimuli bring about weak excitations in the nerve fiber, it must most certainly be expected that on the cessation of the response, weak stimuli applied at the central nerve end would still, by slight increase of the intensity of stimulation, be followed anew by reaction in the muscle. This is all the more to be expected, because the irritability of the narcotized stretch, as shown by stimulation with the electrodes inside the chamber, very gradually decreases, so that within the chamber stimuli of moderate strength are still effective. Instead the capability of conduction is completely obliterated, and even the strongest stimuli, applied to the end of the nerve, produce no response in the muscle. This in turn does not agree with the assumption that the intensity of excitation varies with the strength of the stimulus in the individual nerve fiber. The facts here alluded to are, therefore, either not correct, or the intensity of excitation in the individual nerve fibers is independent of the strength of the stimulus, and the view which we have entertained up to the present in this respect is incorrect. [Illustration: Fig. 24.]