The facts would thus seem to warrant the assertion that, as a rule, the venous blood flowing from the intestinal tract of an animal, fed on a rich proteid diet, contains a much larger number of leucocytes than the arterial blood flowing to the intestine; although, if space permitted, we might instance certain occasional exceptions due to various causes, which, however, do not reflect against the view that there is a marked production of leucocytes in the lymph spaces surrounding the intestine, and in the lymph glands of the mesentery, as a normal accompaniment to digestive proteolysis. Taking into account all of the circumstances attending the circulation of the blood through the abdominal organs, especially the rate of flow, and remembering the great increase in the number of leucocytes contained in the blood during the several hours attending digestive proteolysis, it is plain that a comparatively large amount of proteid matter must be transferred from the intestine to the blood in the bodies of the white corpuscles so abundantly produced in the lymph glands, etc., during proteid digestion. Indeed, Pohl calculates, on the basis of his own and the observations of others, that in the case of an animal weighing 5 kilograms, and fed with 100 grams of fresh beef, containing 20 grams of proteid matter, the entire amount of albumin required to supply the loss incidental to the normal physiological processes of the body could be absorbed into the circulation from the intestine in the form of leucocytes, assuming a digestive period of six hours. Moreover, the evidence acquired from Pohl’s experiments of the enormous production of new cells in the intestinal walls during the height of digestion renders such a theory of the transference of proteid matter from the alimentary tract to the tissues and fluids of the body quite plausible. At the end of twenty-four hours the leucocytes have fallen back to their normal number, having presumably been broken down in the blood-plasma or dissolved in the tissues and organs, thus giving up the proteid matter, of which they are composed, for the general nourishment of the body. Obviously, we can not admit that all the proteid matter of the food is absorbed in the form of leucocytes, for, as we know, some at least of the proteid food ingested is carried beyond the peptone stage, either through the action of trypsin, or through the action of the organized germs in the intestine, but we can certainly accept the views so admirably worked out by Pohl, in so far as they indicate one way in which proteid matter may pass from the intestine into the blood, after having undergone a preliminary transformation in the alimentary tract into primary albumoses and peptone. Again, if Pohl’s views are correct, we see that the proteid foods are quickly transformed into organized material in the body of the lymph cell prior to their absorption into the blood, a view which is in harmony with the long-known fact that