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The above results do not show an increase in permeability due to the addition of capillary active substances. The membranes were unaffected by the substance added except for a marked decrease in measured permealbility in the case of 0.1 per cent saponine.Membranes of the thickness used in this work and having an alcoholic index (Brown) of 98 were found to be very permeble to hemoglobin, those of 94 somewhat permeable and 90 impermeable to this substance. We did not succeed in increasing the permeability of a 94 membrane, or in rendering a 90 membrane permeable to hemoglobin by the use of sodium oleate, bile salts, saponine, peptone, or the blood plasma, pleural fluid, or water solution of the alcoholic extract of the residue from evaporated urine of nephrosis cases. This is a preliminary report.

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