SUMMARY1. A 'mini' canine mucosal membrane preparation permitting simultaneous determination ofwater (Jv) and glucose (Jg) absorption rates, microscopic examination or micropuncture of the villi was used in this study.2. The small membranes were more stretched than the large ones, with more than a one-fold increase in both J, and Jg, apparently due to a change in architectural orientation between the villi and subvillous supporting tissue so as to facilitate water transport via the lymphatic system. 3. During stirring of the bathing solution, the villi in the small membranes were widely separated from each other with more to-and-fro swaying movements than in the large ones. Stirring was seen to cause up-and-down movements of the loosely suspended large membranes but not the small ones. In the small membranes stirring caused no change in J, but an increase in Jg due to the increase in glucose concentration in the absorbate, while in the large membranes both J, and Jg were greatly increased. It is thus considered that the increase in absorption in the large membranes caused by stirring is mainly due to the increased membrane movements promoting lymph flow.

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