. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Crystals of uric acid. Sometimes (and less rarely than has been sup- posed) the rhomboidal prisms are thick, solid- looking, and cuboid in appearance. We have lately seen a;W/We(non-irridescent) of bloody urine after scarlatina formed of crystals of this kind (fig. 7«, 6). Sometimes, again, frag- ments of, or entire, crystals unite so as to form lanceolate or stellate figures ; this form may be produced (as shown by Rayer, fig. 78, c) by artificial precipitation. 2. The unite of ammonia calculus (of which the existence w
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Crystals of uric acid. Sometimes (and less rarely than has been sup- posed) the rhomboidal prisms are thick, solid- looking, and cuboid in appearance. We have lately seen a;W/We(non-irridescent) of bloody urine after scarlatina formed of crystals of this kind (fig. 7«, 6). Sometimes, again, frag- ments of, or entire, crystals unite so as to form lanceolate or stellate figures ; this form may be produced (as shown by Rayer, fig. 78, c) by artificial precipitation. 2. The unite of ammonia calculus (of which the existence was denied by , on the plea that the ammonia evolved from certain calculi is in reality derived from associated triple phosphate, or from urea and the ammo- niacal salts of the urine,) is said by Fourcroy and Prout to be rare, and more frequent in children than in adults, a statement which has been copied by various writers. The tables collected by Dr. Prout show that of 709 simple calculi 59 were composed of urate of ammonia nearly pure, 159 mainly of this salt mixed with variable proportions of the urate and oxalate of lime and phosphates. The shape of this cal- culus is more irregular than that of uric acid masses, but still inclined to the ovoid ; it does not reach any large size, and has a smooth or granular surface. Internally it is laminated; of clay colour ; its fracture earthy, and its den- sity considerably less than that of lithic acid. Of 163 alternating" calculi grouped in Dr. Prout's tables we find that 239 had a nucleus of pure urate of ammonia. In the majority of cases, then, this salt or uric acid forms the ground- work of calculous accumulation ; for they con- stitute either the entire mass, or the nucleus, of 938 among 1473 calculi of ascertained com- position in the following proportions, exclusive of many others in which they were mixed irregularly with other saline matters. Calculus. Nucleus. Uric acid, 230 251 Urate of ammonia! pure and imp
Size: 1773px × 1410px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, booksubjectanatomy, booksubjectphysiology, booksubjectzoology
