Four solutions for machine perfusion and preservation of is chœmically damaged canine kidneys were compared. They were (i) canine Cryoprecipitated plasma, (ii) canine albumin, (iii) human stable plasma protein, and (iv) human albumin. The results with both canine protein solutions were satisfactory. The solutions containing human protein were found unsuitable for canine kidney preservation. It was concluded that albumin solutions were at least as effective as cryoprecipitate for 24‐hour perfusion of ischœmically damaged canine kidn