Rats were made deficient in vitamin E by feeding them on casein or yeast diets.Liver slices from these animals were unable to reaccumulate potassium removed by leaching in the cold.Cooled slices show a falling off in oxygen uptake.These defects were not prevented by feeding with selenium but were promptly reversed by giving oc-tocopherol or by the addition of antioxidants to the incubation solution.It is concluded that the defect in vitro in oxygen uptake by vitamin E-deficient tissues follows disturbances of ionic composition due to cooling.Analogues of the two predominant groups of flavonoid components, based on robinetinidin and fisetinidin, have been isolated or identified from fresh mature black-wattle bark.Myricitrin and quercitrin, related to the two minor groups based on delphinidin and cyanidin, have been isolated from fresh immature blackwattle bark.All flavonoid components hitherto isolated from black-wattle bark fall into one of these four patterns of phenolic hydroxylation.