A method for recovering the total biocolloids of urine by a combination of dialysis and ultrafiltration has been described (1). These biocolloids have been separated into two groups on the basis of their solubility in molar sodium chloride. The electrophoretic properties of those components which are soluble in molar sodium chloride have been reported, both for normal subjects and for patients with developing renal calculi (2). The urinary biocolloids which are insoluble in molar sodium chloride form the subject for the present study.
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Boyce et al. (1955) studied this question.