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.