Relapsing fever as a curative agent in paresis has been tried as far back as 1921, when several continental observers favourably commented on it. The close similarity between the two diseases in their causal agents and blood-serum reactions strongly commends the theory that the induction of a spirochótal fever in general paralysis might lead to the production of immune and anti-bodies in sufficient amount as to effect an amelioration in the symptoms, if not a complete arrest in the progress of this deadly malady.