Properties of Organic Acid Solutions which Determine their Irritability to the Bladder Mucous Membrane and the Effect of Magnesium Ions in Overcoming this Irritability 1 2 1This work was supported by a grant from the Mary Gove Pitman Fund. 2This paper is a modified and abbreviated version of a paper entitled “Retrograde Dissolution of Calcium Phosphate Urinary Calculi’ by Dr. Howard I. Suby and which was a prize essay read at the annual meeting of the American Urological Association, New York, N. Y., June 2, 1942.