“…The satisfactory absorption of amino-acids does show, however, that the intestinal absorption defect is not universal; the exact process involved in amino-acid absorption is not known, but absorption is more rapidthan can be accounted for by simple diffusion (Hober, 1945). Fourman (1947) has found evidence of impaired xylQse absorption in sprue: this may imply a more fundamental absorption defect than that shown by flat glucose curves, since xylose absorption, unlike that of glucose, is not inhibited by phloridzin and may therefore be produced by ' , t different and simpler mechanism.…”