The components of hot water extracts of bark of P. radiata are mainly of high molecular weight. The oligomeric fraction contains the procyanidins 6-3, B-i and C-2. Dihydroquercetin, quercetin, 3,5,3',4*-tetrahydroxystilbene, catechin, the new compound 3,5,3',4*-tetrahydroxystilbene 4*-oß-glucoside, the behenyl and lignoceryl esters of ferulic acid and 2 unidentified compounds are also present. The latter are found only in the phloem; the stilbene glucoside, catechin, procyanidins and polymers of medium molecular weight are found in the outer phloern to the middle of the outer bark. The more highly polymerised material, the stilbene, quercetin and dihydroquercetin are found in the outermost portion of the outer bark. A description is given of a rapid method to characterize the polyphenolic content of the water extracts from the bark by using a cölumn of Sephadex LH-2O and eluting with a 50% mixture of acetone and dimethyl-formamide.