Claude Bernard's observation of the pain produced by stimulation of the anterior roots and the failure of section of the posterior roots to relieve the pain of gastric crises, herpes zoster or causalgia have given rise to doubt of the validity of the Bell-Magendie law. In 1911, Leonard Kidd proposed that pain could be conducted antidromically over the anterior roots. In recent years this theory has been supported by Lehmann (Breslau), 1920; Foerster, 1920; Lehmann (Göttingen), 1920; Shawe, 1922, and Wartenburg, 1926. Lehmann and Shawe stated that the anterior roots regularly convey deep sensibility. Foerster and Wartenburg believed that the sensory fibers carried by the anterior roots are only auxiliary ones which transmit a particular type of deep sensation, and function chiefly when the posterior roots are interrupted. We do not propose to enter into a discussion based on the observations of others or to present a complete bibliography of