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a bright pink colour if the urinary acidity is satisfactory, but an orange or yellow colour if it is too alkaline. The. amount of ammonium chloride administered was then increased or reduced accordingly. As a rule, a satisfactory acidity can be produced with about half the dose prescribed above. In private patients the ammonium chloride was given in 1.0 gramme capsules (4 to 8 daily). Finally, 4 cases were treated by ammonium mandelafe (see later). Specimens of urine were examined at two-day intervals where possible. When the deposit (examined as