0270 - Page sans numérotation - Plate XXIX / Fig. 1. Section of an uric acid calculus from the kidney. Fig. 2. External view of the same. Fig. 3. Section of a large calculus made up of three distinct uric and acid stones, united by earhy phosphates. Fig. 4. Section of a singular but not very uncommon form of calculus, the centre consisting of uric acid, the pinkish gray part of urate of ammonia and uric acid, the white layer at the sides of phosphate of lime. Fig. 5 & 6 Exterior and section of a cystic oxide calculus. The confusedly crystalline structureis well seen in fig.6, wich represents a section and the minutely tubercular appearance of its exterior in fig. 5 . Fig. 7. A calculus almost entirely made up of uric acid and urate of ammonia deposited on a piece of steel apparently the end of a stilet. Fig. 8. The nucleus and exterior consist of uric acid and urate of ammonia,the intermediate layer of oxalate of lime. Fig. 9. A calculus chiefly made up of oxalate of lime, having a nucleus of impure urate of ammonia, and a white layer chiefly consisting of phosphate of lime Figs. 10 & 11 Section and exterior of small uric acid calculus, thinly coated with urate of ammonia. Fig. 12. Shows the crystalline centre and laminated structure of a very characteristic specimen of pisiform, uric acid concretion

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