The practice of surgery . metimes either grouped togetheror armed with projecting spicuhe like stalac-tites. The last form is unusual, and has beenconsidered by some observers as urate of crystalline deposit of uric acid assumesgenerally the form of rhombic prisms, but ap-pears in various modifications of this primarytype ; the most usual is that in which the rhom-boids or lozenges are very thick and roundedat the angles, so as to resemble, when placedupon their sides, thick cylinders, for which theymay readily be mistaken, especially if groupedtogether in masses, as frequently occurs
The practice of surgery . metimes either grouped togetheror armed with projecting spicuhe like stalac-tites. The last form is unusual, and has beenconsidered by some observers as urate of crystalline deposit of uric acid assumesgenerally the form of rhombic prisms, but ap-pears in various modifications of this primarytype ; the most usual is that in which the rhom-boids or lozenges are very thick and roundedat the angles, so as to resemble, when placedupon their sides, thick cylinders, for which theymay readily be mistaken, especially if groupedtogether in masses, as frequently occurs. The uric acid crystals aregenerally colored, and have, under the microscope, a peculiar deep ambertint, which is highly characteristic. All the deposits of either free or combined uric acid are highly solu-ble in caustic potash; in soda, they are less so. The urate of ammonia,which forms the principal part of the amorphous deposit, is tolerablysoluble in water at the temperature of the body; and hence is seldom Fig. 187. Urate of Ammonia under the mlcr ixcope. THE LITIIIC DEPOSIT. 439 deposited except on cooling of the urine after excretion. In some cases,however, especially when the urine contains an excess of acid, the urateof ammonia is deposited within the bladder. The uric acid deposit, onthe contrary, which is thrown down bythe addition of almost any acid to urineholding urate of ammonia in solution, issoluble only to a very slight extent inwater, even with the aid of heat; andhence is a comparatively frequent depositin the urine on emission, although muchless common than the amorphous sedimentas a result of cooling. Both deposits aredecomposed by strong nitric acid with theaid of heat, and leave on evaporation abeautiful lake-colored residue, which be-comes purple in tint by the addition ofammonia (purpurate of ammonia, murex-ide). Urine containing these sedimentsis usually rather high-colored, of good orexcessive specific gravity, highly acid, andoften scanty. Not unf
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