. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 80 in urine (cold and hot), and in acetic acid. It is soluble in ammonia, from which solution it may be obtained by evaporation in the peculiar crystalline form (fig. 82), visible with the microscope only. Cystin is soluble without effervescence in nitric acid; from this solution silky crystals of aciculated shape and brilliant white colour may be obtained by evaporation. Treated with nitrate of potass, the sulphur (26 per 100 nearly) contained in the cystin passes to the state of sulphuric acid, discoverable by a salt o
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 80 in urine (cold and hot), and in acetic acid. It is soluble in ammonia, from which solution it may be obtained by evaporation in the peculiar crystalline form (fig. 82), visible with the microscope only. Cystin is soluble without effervescence in nitric acid; from this solution silky crystals of aciculated shape and brilliant white colour may be obtained by evaporation. Treated with nitrate of potass, the sulphur (26 per 100 nearly) contained in the cystin passes to the state of sulphuric acid, discoverable by a salt of baryta. Cystin exhales a peculiar phos- phorus-like odour when burned on platina. The crystalline form of cystin is the hexa- gonal prism ; the crystal is transparent, more or less regular, and varies considerably in size (fig. 82V Fig. 82. PRODUCTS, ADVENTITIOUS. The neutral phosphate of ammonia and mag- nesia (the only one observed in urine at the moment of emission) occurs in white trans- parent crystals of perfectly regular forms, re- ferable to the right rectangular prism (fig. 83). Fig. Crystals of cystin : some are of much larger size titan those represented. 5. The phosphate of ammonia and magnesia calculus (triple phosphate) is generally of oval or rounded shape, but may be of irregular form ; when constituting the entire substance of a calculus (which is rare), it is of small size usually ; its external colour is whitish ; its surface uneven and crystalline. Internally it is generally granular and opaque, though occasionally laminated and somewhat trans- parent ; in the former case of porous texture, in the latter compact and dense, and of dirty white colour. 6. The neutral phosphate of lime calculus, remarkable for the smoothness of its exterior, is of pale brown colour, moderate size, and great rarity, — so much so that to the chance experience of Dr. Wollaston almost alone are we indebted for what is known of its charac- ters. It is composed of laminae, e
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