The signs of internal disease, with a brief consideration of the principal symptoms thereof . a trace in normal urine. After taking benzoic acid oreating certain fruits, the crystals are seen, but have no clinical signifi-cance. They occur as colorless prisms with sharply-defined ends andas needles. They do not respond to the mul-exide test as does uricacid. Calcium sulphate crystals occur as radiating needles and are oflittle importance. Phosphates. The alkaline phosphates are not found in urinary EXAMINATION OF THE URINE 329 sediment. The earthy phosphates are the ammonio-magnesium phos-phat
The signs of internal disease, with a brief consideration of the principal symptoms thereof . a trace in normal urine. After taking benzoic acid oreating certain fruits, the crystals are seen, but have no clinical signifi-cance. They occur as colorless prisms with sharply-defined ends andas needles. They do not respond to the mul-exide test as does uricacid. Calcium sulphate crystals occur as radiating needles and are oflittle importance. Phosphates. The alkaline phosphates are not found in urinary EXAMINATION OF THE URINE 329 sediment. The earthy phosphates are the ammonio-magnesium phos-phate, known as triple phosphate, and calcium phosphate. The first occurs in various forms, the beveled triangular prism,or coffin lids being the most characteristic. These may be squareor oblong, are glassy or light-green in color and easily disappear on the addition of acetic acid. Stellate featheryforms are less frequent but easily distinguished. Calcium phosphate is usually an amorphous, granular, whitedeposit which, as said, is precipitated by heat and may be mistaken for. Fig. 77—Triple Phosphates. Pine Branch Crystals, Rapid precipitation. albumin. The crystalline form, rarely seen, consists of rods, separate-or grouped into wedges, or of stellate, colorless rosettes. The deposit of triple phosphate in freshly voided urine meansammoniacal decomposition in the urinary passages,.as pyelitis and cys-titis. The deposit of phosphates in other urine occurs in convalescence,in dyspepsia, particularly nervous dyspepsia, phthisis and as pointedout by Sir William Roberts, in cancer. Cystine is rarely seen. It may occur in diminished bile secre-tion. It occurs as opalescent hexagonal tablets wh^ch sometimes over-lap each other. It aids in forming calculi. A drop of HCl or of am-monia on the slide causes its disappearance. With the latter it re-appears on evaporating the reagent. Leucin is rare. It appears as white lamella? or as yellow spherules 230 EXAMINATION OF THE
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