Renal diseases : a clinical guide to their diagnosis and treatment . ng order—yellow, green, blue, violet, red. Some prac-tice is necessary to enable the eye to determinewhen the spectrum is divided into two equalhalves of color of equal intensity. When thetwo halves are similar in color, the scale isread oft] and the number of degrees from zeroindicates the amount of sugar present. In a very useful little work, A Guide tothe Examination of the Urine, by Dr. Wick-ham Legg, there are very good directions forthe use of the polariscope for the estimation ofsugar. Cystin. Cystin is a substance of
Renal diseases : a clinical guide to their diagnosis and treatment . ng order—yellow, green, blue, violet, red. Some prac-tice is necessary to enable the eye to determinewhen the spectrum is divided into two equalhalves of color of equal intensity. When thetwo halves are similar in color, the scale isread oft] and the number of degrees from zeroindicates the amount of sugar present. In a very useful little work, A Guide tothe Examination of the Urine, by Dr. Wick-ham Legg, there are very good directions forthe use of the polariscope for the estimation ofsugar. Cystin. Cystin is a substance of very rare occur-rence urine. It was discovered by in calculi, but it has been observeddissolved in the urine, and deposited afterbeing passed as six-sided plates and hexagonalStellas. These crystals are the only means ofdiagnosis, and they are very is soluble in caustic ammonia, and may THE URINE 277 PROPERTY. Cystin. be precipitated by acetic acid, and crystallizesin hexagonal tablets or plates. It also deposits Fig. Cystin. from the urine spontaneously in similar substance is of interest in a chemico-pathological point of view, from its containingso large an amount of sulphur as 27 per a clinical point of view its importance ischiefly in relation to the possible formation ofa cystine calculus. The urine containing cys-tine when passed is usually feebly acid, has apeculiar odor, is slightly turbid, and depositsthe characteristic crystals on cooling. It hasbeen most frequently observed in young womenof chlorotic aspect and condition. Dr. Kobertswork contains an excellent account of thissingular disorder. 1 The urine in which cystin occurs has a color of an unripe lemon,greenish-yellow. 24 278 THE URINE PROPERTY. Leucin These crystalline substances Lave beenand found in the urine, but they have no affinity tyrosin. to renal disease. They are significant of acuteatrophy of the liver. They have also beendetected i
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