Un traité pratique sur les maladies rénales et urinaires : y compris les dépôts urinaires . qui sont nécessairement déposés underthose circonstances. L'urate d'ammoniac s'est habituellement adense couleur blanche ; mais j'ai connu il posséder une beautifulviolet hue. Deux formes sont vues sous le microscope. Le plus com-mon sont des sphères et des masses globuleuses, qui semblent presque noire par trans-mitted la lumière, en raison de leur opacité(voir fig. 11, a). Ces sphères areeasily urinecontaining obtenu en laissant un l'urate tostand amorphe dans l'air jusqu'à ce qu'il becomesammoniacal. La deuxième forme (u)se produit comme très minute slende

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A practical treatise on urinary and renal diseases : including urinary deposits . which are necessarily deposited underthose circumstances. The urate of ammonia has usually adense white colour; but I have known it possess a beautifulviolet hue. Two forms are seen under the microscope. The most com-mon are spheres and globular masses, which appear almost black by trans-mitted light, owing to their opacity(see Fig. 11, a). These spheres areeasily obtained by leaving a urinecontaining the amorphous urate tostand in the air until it becomesammoniacal. The second form (u)occurs as very minute slender dumb-bells : these generally lie singly ; ortwo lie athwart each other so as toform a cross ; or three are unitedso as to form a rosette. They be-come coarser and larger with long keeping of the urine. Thisdeposit has no special clinical significance; its occurrence ismerely an incident in the ammoniacal decomposition of theurine. It is a frequent ingredient of the secondary phosphaticcrust which invests urinary calculi in the later periods of theirgrowth (see Ueolithiasis).. Fig. 11. Urate of amnion a spon-taneously deposited, a. Spheresand globular masses; b. Dumb-bells, crosses, rosettes. V.—OXALATE OF LIME. [Oxaluria ; oxalic acid diathesis.) Naked-eye characters.—A deposit of oxalate of lime is usuallyvery scanty, and looks like a slight cloud of mucus. Owing, tothis, and its colourlessness, it seldom attracts the attention ofa patient. If, however, the urine be transferred into a urine-glass immediately after emission, as is usually practised in hos-pital wards, the following appearances are produced, which aresufficiently characteristic to enable the observer to recognise majority of urinary calculi. (On the Microscopic Structure of Urinary Calculi, Lond. 1873.) OXALATE OF LIME. 75 the deposit with certainty by the unaided eye. The sides ofthe glass are seen to be traversed by very numerous fine lines, running in bands, transversely or obliquely, giving an appear-anc

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