Abstract
In the newt, Triturus cristatus carnifex (Laurenti), the spleen normally contains a reserve of erythrocytes which varies according to the respiratory condition of the animal. In chlorobutanolanaesthetized specimens, histological analyses and in vivo observations following the injection into the bloodstream of fluorescent microspheres 10 μm in diameter (FluoresbriteTM YG, Polysciences Inc., USA) show that, in steady conditions, the stored red blood cells are not segregated in the spleen but pass through the organ with a very slow flow; their time of transit in a spleen maintained in a state of maximum congestion is 41.5 ± 14.2 minutes (mean ± standard deviation.
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