Finally, the recent investigations of _Vészi_[32] with strychnine poisoned ganglia cells of the posterior horns of the spinal cord, have made it appear probable that “the all or none law” can be applied likewise to the individual ganglion cell. He draws this conclusion not only from the fact that all reflex contractions of a muscle of a strychninized frog are maximal, whether they are produced by weak or strong stimuli, but also especially because of the loss in the strychninized spinal cord of the capacity of the summation of irritability. The normal spinal cord does not reflexly respond at all to weak single stimuli, but responds to equally weak faradic stimulation very readily. Therefore, the threshold lies very high for the individual induction shock and very low for faradic shocks. But these differences are equalized in the strychninized frog. This seems intelligible, when we assume that the strychninized cell responds to every stimulus, to which it responds at all, to the maximal extent which is permitted at that moment by its stored up energy, otherwise the excitation would necessarily be summated by faradic stimulation. [26] _Bowditch_: “Ueber die Eigentümlichkeiten der Reizbarkeit, welche die Muskelfasern des Herzens zeigen.” In Arbeiten aus der physiologischen Anstalt zu Leipzig VI. Jahrgang 1872. [27] _Kronecker_: “Das characteristische Merkmal der Herzmuskelbewegung.” In Beiträge zur Anat. und Physiol. Als. Festgabe Carl Ludwig gewidmet von seinen Schülern. Leipzig 1874. [28] _McWilliams_: “On the rhythm of the mammalian heart.” Journal of Physiology, Vol. IX, 1888. [29] _Gotch_: “The submaximal electrical response of nerve to a single stimulus.” Journal of Physiology, Vol. XXVIII, 1902. [30] _Keith Lucas_: “On the graduation of activity in a skeletal muscle fibre.” Journal of Physiology, Vol. XXXIII, 1905–06. [31] _Keith Lucas_: “The all or none contraction of skeletal muscle fibre.” Journal of Physiology, Vol. XXXVIII, 1909. [32] _Vészi_: “Zur Frage des Alles oder Nichts-Gesetzes beim Strychninfrosch.” Zeitschrift für allgemeine Physiologie Bd. XII, 1911.