A practical treatise on urinary and renal diseases : including urinary deposits . r in the febrile state,give occasion to such an exudation and supply a starting pointto a process which does not attract attention until after a longlapse of time* * See Carter On the Microscopic Structure and Formation of UrinaryCalculi. Lond. 1873. And Dr. Ords paper Trans. 1875. URATE CONCRETIONS. 277 OF THE PARTICULAR VARIETIES OF URINARY GRAVEL AND CALCULI. 1. Uric acid.—This is by far the most frequent species ofurinary concretion. It constitutes probably five-sixths of allrenal concretions, and
A practical treatise on urinary and renal diseases : including urinary deposits . r in the febrile state,give occasion to such an exudation and supply a starting pointto a process which does not attract attention until after a longlapse of time* * See Carter On the Microscopic Structure and Formation of UrinaryCalculi. Lond. 1873. And Dr. Ords paper Trans. 1875. URATE CONCRETIONS. 277 OF THE PARTICULAR VARIETIES OF URINARY GRAVEL AND CALCULI. 1. Uric acid.—This is by far the most frequent species ofurinary concretion. It constitutes probably five-sixths of allrenal concretions, and of vesical calculi which have only recentlydescended from the kidney. As gravely uric acid may be passedin the form of small distorted crystalline agglomerations, or aslittle smooth spherical bodies, ranging from the size of a poppyseed to that of a mustard seed, or in flattened warty concre-tions as large as split peas. All these have a yellowish,brownish, or reddish colour. They are derived from thekidney, and may be discharged singly or in numbers at irre-gular Fig, 42.—Section of a uric acid calculus. TVhen retained in the bladder, they grow into flattened ovalcalculi, sometimes roundish, sometimes elongated like analmond. They vary in colour from a light fawn to a deepbrick-red, according to the quantity and nature of the urinarypigment which they contain. Their surface is usually studdedwith minute tubercles, or mamillatious, which are worn intosmooth facets if more than one stone co-exist in the weight varies from a drachm to an ounce, but sometimesreaches four or five ounces. Uric acid calculi possess considerable hardness; theirspec. grav. is about 1*5. Uric acid is best recognised by the 278 GRAVEL AND CALCULUS. murexid test, described at p. 63. Its most important pro-perties, from a therapeutical point of view, are its solubility invery weak solutions of the carbonates of potash and soda, andits insolubility in strong solutions of the sa
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