“…After intravenous injection of a radioactive inorganic ion, equilibrium between plasma and lymph, with equal concentrations and specific activities, is reached within 20 min (Cope & Moore, 1944). However, with labelled protein the rate of transfer from plasma to lymph is similar to that found for 59Fe in the present work (Cope & Moore, 1944;Wasserman & Mayerson, 1951;Abdou, Reinhardt & Tarver, 1952;Morris, 1956). Furthermore the iron, total protein or ,8-globulin found in the first 24 hr lymph all were similar proportions of the amount present in the plasma (mean values 85, 78 and 93 % respectively).…”