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1. Under specified experimental conditions the distribution space of labelled chylomicrons in the kidney was 13·8 ± 0·9 ml./100 g. tissue. The assumption is supported that this provides a measure for the quantity of intravascular plasma constituents.
2. Values for red blood cells and albumin distribution spaces were 5·2 ± 0·6 and 20·2 ± 1·0 ml./100 g tissue, respectively, in the whole kidney. The ratio of tissue haematocrit over simultaneous arterial haematocrit averaged 0·56. The extravascular albumin fraction amounted to about 31·0% of the total albumin in the whole kidney.
3. A statistically significant correlation was demonstrated between osmotic urine/plasma (U/P) ratios (within the approximate limits of 0·6-1·8) and quantities of extravascular albumin in the medulla.
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