Experiments were done of the electromyography of the patients complaining vertigo with a view to its introduction for testing the vestibular function. As to the cause of vertigo the diseases suojected are grouped as follows, i. e. otitis media (7 cases), Meniere's disease (6 cases), disturbances of central nervous system (3 cases) and two other cases. Electromyograms were recorded from M. biceps brachi, M. solius and M. triceps brachi during the resting stage, the passive extention and the voluntary contraction respectively. In the course of a slight contraction of the muscles, observation was made of effects of the neck reflex and the labyrinthine caloric stimulation upon their discharge frequency.