Where is the pathogenesis of Phosphoric acid found ? Hahnemann's Materia Medica Pura . What is Phosphoric acid ? It is the ordinary Phosphoric acid of the chemist. How is it prepared ? One part, by weight, of purified Glacial phosphoric acid is dissolved in 90 parts, by weight, of distilled water and 10 parts of alcohol added. Drug power, 1/100. This is marked 2x. Give the general action of Phosphoric acid. It produces nervous prostration and debility ; an atonic condition of the gastro-intestinal tract ; and bone affections. Mention three grand characteristic uses of Phosphoric acid.