The RBC velocity, cell flux and tube hematocrit were measured in the arterial and venous ends of the rat cremaster capillaries. The widening of capillaries from the arterial to venous ends from 4.9 +/- 0.1 to 6.5 +/- 0.2 mu was accompanied by a decrease of the tube hematocrit from 32 +/- 2 to 19 +/- 1 due to the discrepancy between the RBC velocity drop from 523 +/- 36 to 397 +/- 22 mu/sec and the lumen area widening (76%). The attenuation of the Fahraus effect with the decrease of capillary diameter was shown, leading to the equality of the tube and discharge hematocrit in the diameter range of 3-4 microns. Negative correlation between the instantaneous values of the RBC vecolity and the tube hematocrit was observed.
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