. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Neutral phosphors of ammonia and magnesia; crystals of spontaneous formation. These crystals are often mixed with amor- phous powder, commonly composed of phos- phate of lime, rarely of urate of ammonia. They are instantaneously soluble in weak acids, and the solution is precipitable by am- monia in the form of the bibasic phosphate. The bibasic phosphate of ammonia and mag- nesia does not appear to exist in urine, even the most strongly alkaline, at the moment of emission. But its crystals are developed with the progres
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Neutral phosphors of ammonia and magnesia; crystals of spontaneous formation. These crystals are often mixed with amor- phous powder, commonly composed of phos- phate of lime, rarely of urate of ammonia. They are instantaneously soluble in weak acids, and the solution is precipitable by am- monia in the form of the bibasic phosphate. The bibasic phosphate of ammonia and mag- nesia does not appear to exist in urine, even the most strongly alkaline, at the moment of emission. But its crystals are developed with the progress of decomposition, and may be obtained from any urine by rapidly adding large quantities of ammonia. Microscopically (fig. 84) these crystals appear aciculated and grouped at angles of 60°, so as to resemble a pinnate or bipinnate Silasic phosphate of ammonia and magnesia. Phosphate of lime occurs as an amorphous powder ; very soluble in acids, it does not effervesce under their action, like the urate of ammonia, nor, like that salt, furnish crystals of uric acid under the same circumstances; when the phosphate has been dissolved in an acid, ammonia precipitates awhile amorphous mass from the solution. 8. The xanthic ojcide (uric oxide, xanthin, nrous acid) calculus is of extreme rarity ; four examples only (analysed by Marcet, Laugier, Stromeyer, and Dulk,) have as yet been met with. The external surface is described as smooth and polished, and of light brown co- lour. Some fragments of the calculus analysed by Stromeyer are preserved in the University College Collection; their fracture is sharp, their colour pinkish brown; they are com- posed apparently of easily separable concen- tric laminae, and are very hard ; they become waxy-looking when rubbed. Marcet's speci- men weighed 8 grains, that of Stromeyer 338 grains, that of Dulk 7 grains; those examined by Laugier were very small. In Dulk's case. Please note that these images are extracted from scanned page images
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