types of proteid are manufactured either in the epithelial cells of the intestinal walls during absorption, or elsewhere in the body after absorption. If this latter is the case, the liver might readily be regarded as a likely spot for the synthesis to occur. [14] J. B. Leathes: Problems in Animal Metabolism. Blakiston’s Son and Co., 1906, p. 123. Bearing in mind what has been said regarding the production of specific types of proteid by every species of animal, we can the more readily conceive of a synthesis “out of fragments of the original molecules rearranged and put together in new combinations, by processes in which the intestine can hardly be supposed to play a part.” This, the liver might well be assumed as capable of accomplishing, and if we were disposed to accept this view we might use as an argument the fact that the products of proteid digestion are taken directly to this organ, before being cast loose in the tissues and organs of the body. There is perhaps as good ground for assuming that a synthesis or reconstruction of proteid takes place all over the body; that, as suggested by Leathes, “the synthesis of proteids is a function of every cell in the body, each one for itself, and that the material out of which all proteids in the body are made is not proteid in any form, but the fragments derived from proteids by hydrolysis, probably the amido-acids, which in different combinations and different proportions are found in all proteids, and into which they are all resolved by the processes, autolytic or digestive, which can be carried out in every cell in the body.” It is certainly a reasonable hypothesis, and since we lack positive knowledge it cannot at present be disproved. All that we can affirm in the light of established fact is that the products of proteid digestion are absorbed from the intestine by way of the portal circulation, and that either in their passage through the intestinal wall, or later on in the liver or elsewhere, there is a construction of new proteid to meet the wants of the body. The liver, indeed, may be effective in both construction and destruction of proteid, but there is no way of telling at present just how far it acts in either direction. Regarding the absorption of fats, a single statement will suffice, in addition to what has already been said. Fats gain access to the general circulation by passing from the intestine into the lacteal radicles, thence into the lymphatics, whence they move onward into the thoracic duct, and from there are emptied into the great veins at the neck. A small amount is apparently absorbed in the form of soap by the portal circulation, but by far the larger amount of fat gains access to the blood stream without going through the liver. * * * * *