The effect of depersolone, of the oxygenation of the perfusing solution and of phenoxybenzamine pretreatment has been studied in the isolated rat liver intermittently perfused with a solution containing low molecular weight dextran at 4 degrees C. The use in liver preservation of Collins' C3-solution and of a special albumin-containing solution was tested. The behaviour of acid and alkaline phosphatase, esterase, lactate dehydrogenase and adenosine triphosphatase in the preserved liver was followed by means of histochemical methods allowing semi-quantitative evaluation. Pretreatment with phenoxybenzamine and perfusion by an albumin-containing solution reduced the lesion of the liver, while prednisolone and oxygenation of the perfusion solution improved preserving effect only moderately.