“…Q uite a large p a rt of the low molecular fractions are excreted by the kidneys bul part of the more high m olecular fractions is retained. Studies with tissues-staining techniques and labelling of d ex tran w ith C14 show th a t the retain ed m aterial is eventually eli m inated (Cargill and Bruner, 1951;Detrick et al, 1958;Cray, Siiteri arid Pulaski, 1951;M o tvry, Longley and M illican, 1952;Persson, 1951/52;Scully et al, 1952;Swedin and Aberg, 1952;Turner and Maycock, 1958). At least a p art of the dextran is available m etabolically.…”