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Tending to prevent the formation of urinary calculi, or to destroy them when formed.

These salts also are an important, if not the chief, constituent of biliary and urinary calculi.

A variety of urinary calculus—the uric acid—formed by concretions of this substance in the kidneys is a not unfrequent occurrence in connexion with gout; hence the well-known association of this disease and gravel.

The ova often serve as a nucleus for urinary calculi.

Another insoluble salt which enters largely into the composition of many urinary calculi of the ox is carbonate of lime.