“…Experiments were undertaken therefore, (1) to attempt, using sections of the small intestine of sheep, a repetition of the surviving tissue experiments by which Wiese, Mehl, and Deuel (1947) had so elegantly established the site of conversion in the rat, and, if positive results were obtained, (2) to investigate the mode of transport of the vitamin A from the intestine to the liver, and (3) to determine whether conversion occurred throughout the length of the small intestine or was restricted to certain regions. Since this work was commenced, Thompson, Ganguly, and Kon (1949) have extended previous observations with rats and have shown the site of conversion to be the wall of the intestine in pigs also, while similar findings have been reported for sheep, goats, and rabbits (Goodwin and Gregory 1948), and recently for calves (Stallcup and Herman 1950). Using somewhat different methods, the present investigation has, however, provided further evidence in support of the findings of these later workers and the results are submitted in confirmation of their conclusions regarding the site of conversion in cattle and sheep.…”