XIII. On cystic oxide, a new species of urinary calculus

Abstract

The principal design of the present essay is to make known the existence, and to describe the leading properties of a new species of urinary calculus from the human bladder; but I shall at the same time take the opportunity of correcting an inaccuracy or two that I have observed in my former communication on this subject. (Phil. Trans. 1797.) I, on that occasion, took notice of five kinds of urinary calculi, 1. The lithic acid, since called uric acid, originally analysed by Scheele. 2. The oxalate of lime, or mulberry calculus. 3. The phosphate of lime, or bone-earth calculus. 4. The ammoniacal phosphate of magnesia. 5. The fusible calculus, which consists of the two last species combined.