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1. The absorption, without change, of [¹³¹I] and [¹²⁵I]solutes of high molecular weight after duodenal infusion has been measured in anaesthetized calves less than 20 hr old by analysis of lymph collected from the thoracic or intestinal duct.

2. Factors present in boiled bovine colostrum whey known to be necessary for the rapid absorption of [¹³¹I]bovine serum -globulin have now been shown to accelerate the passage of [¹³¹I]polyvinyl pyrrolidone (PVP) of mean mol. wt. 160,000 (K.60) into the lymph in a comparable manner.

3. [¹³¹I]PVP K.30 (mean mol. wt. 40,000) and [¹³¹I]human serum albumin could be absorbed to some degree in the absence of solvent factors necessary for the absorption of solutes of higher mol. wt. and a large proportion of the solute thus absorbed passed directly into the portal capillaries.

4. Lactate and pyruvate and salts of certain lower volatile fatty acids resemble factors in colostrum whey in their facilitation of the absorption of both -globulin and PVP K.60: these active compounds were not however found in colostrum in significant quantities.

5. Potassium isobutyrate was the most effective of the compounds tested and at concentrations of 56·7 m-mole/l. generally accelerated absorption to a greater degree than did colostrum whey itself.

6. Absorption of both -globulin and PVP K.60 from colostrum whey was characterized by a profuse flow of lymph containing relatively low concentrations of labelled solute. In contrast, when these solutes were fed in solutions containing simple compounds such as potassium isobutyrate they appeared in very high concentrations in the lymph, the flow of which remained relatively scant.

7. When [¹²⁵I]PVP was administered in water, little was absorbed. If, however, such an infusion was followed 3 hr later by a duodenal infusion of colostrum, [¹²⁵I]PVP passed into the lymph almost immediately. This response was too rapid for the colostrum to have reached the absorbing cells in the terminal ileum.

8. Intravenous infusions of L+lactate have been found to facilitate the absorption of [¹²⁵I]PVP K.60 introduced into the duodenum in water. This indicates that some of the solvent factors which accelerate absorption may reach the terminal ileum via the blood vascular system after they themselves have been absorbed from the upper small intestine.

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