Studies on the effects of land and air transpnrtation on CPD blood stored for 21 and 28 days are reported. Plasma potassium, supernatant hemoglobin, per cent hemolysis, whole blood pH, plasma sugar, posttransfusion survival (autologous) and t / 2 of the transported units did not differ significantly frcim thosr nf the control units that were left undisturbed in the refrigerator for comparable 1. Clin. Invest. 26: 687, 1947.