“…It has been suggested (Lehmann & Kinzius, 1951;Annersten, Gronwall & Koiw, 1949) that plasma contains a biologically inactive, proteinbound form of adrenaline (called 'adrenalinogen' by Lehmann & Kinzius). In view of the fact that precipitation of proteins involves considerable losses of added adrenaline (Gaddum & Schild, 1934;D'Silva, 1937;Lehmann & Michaelis, 1942) an association between adrenaline and plasma proteins is a reasonable assumption.…”