The chief sphere of action of Phosphoric Acid is upon the nervous system, in which, from waste of nerve tissue or from depression, it produces debility, without erethism (with erethism, Cinchona), giving rise to conditions simulating those which result from continued grief, over-exertion of mind or body, sexual excess, etc. Through this influence its chief local effects are upon the kidneys and male sexual organs, and next upon the bones and skin, as indicated by its pathogenesis. Characteristic symptoms.