The internal remedies which have been recommended and employed in this branch of treatment have been selected purely on the ground of their chemical properties and action on alkaline carbonates out of the body. A vesical calculus, it has been argued, consisting as it does chiefly of calcic carbonate, should be chemically resolved by the repeated administration of mineral acids, experience in the laboratory having taught that the decomposition of the former is readily and surely effected by contact with the latter; hence mineral acids were for a long time, and still continue to be, administered for the puipose of bringing about a solution of the stone. Practical experience, however, has at no time done much to confirm this time-honoured dogma, and the teachings of physiology encourage no sort of belief in its therapeutical value. Even in those instances where the operation of lithotomy is forbidden by the circumstances of the case, we are not warranted by any consideration in relying on so precarious, nay useless, a remedy as the so-called stone solvents.