. A manual of clinical diagnosis by means of microscopical and chemical methods, for students, hospital physicians, and practitioners . Lohnsteins saccharimeter. 450 THE URINR urine. so that this forms a convex cup at the end. The glassplate is now carefully ad/usted. so as to guard against the admissionof babbles of air. The metallic cap is placed in position, carebeing taken to avoid undue pressure. The examinations are madein a dark room : an irdinary lamp is used, and several readings aretaken, until the differences do not amount to more than or Tne tabes should be thoroughly c
. A manual of clinical diagnosis by means of microscopical and chemical methods, for students, hospital physicians, and practitioners . Lohnsteins saccharimeter. 450 THE URINR urine. so that this forms a convex cup at the end. The glassplate is now carefully ad/usted. so as to guard against the admissionof babbles of air. The metallic cap is placed in position, carebeing taken to avoid undue pressure. The examinations are madein a dark room : an irdinary lamp is used, and several readings aretaken, until the differences do not amount to more than or Tne tabes should be thoroughly cleansed immediately afterthe experiment. In every case the filtered urine shoo] I e free from albumin, markedly colored, should Y :- ] reviously treated with neutral leadacetate in substaa filtered. If it is desired to demonstrate only the presence of sugar, thecompensa: >rs are first brought to the zero-position. If now. upon Fig. 103. S?«0li. Soleil-Yentake i interposition of the tube filled with urine, a difference in the colorof the two halves of the field of vision is noted, the presence of an[cally active substance in the urine may be assumed : and if theration is at the same time to the right, the presence of glucose isrendered highly probable, while a deviation to the left will generallybe referable to levulose or /^-oxybutyria acid. Indican. peptones(albumoses i, cholesteriii. and certain alkaloids, it is true, also turnthe plane of polarization to the left : but as a rule these substancesneed not be considered, as cholesterin occurs but rarely, and indicanis usually present in only small amounts in diabetic urines. Albu-moses. if present, must first be removed. Lactose and maltose,which also turn the plane of polarization to the right, may be dis- CARB01IYDRA TES. 451 tinguished from each other and from glucose by the phenylhydrazintest. Levulose turns the plane of polarization to the left. ()\v-bu
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