No general conclusions can be drawn concerning the effects on intestinal elimination produced by feeding diets rich in unsaturated glycerides. Triolein, the triglyceride of the most widely distributed of all naturally occurring fatty acids, produced a laxative effect when added to the standard diet in either ten or twenty per cent concentrations. When the lower concentration of triolein was fed to the larger two dogs, more total lipids and more soap extract were present in the feces than when the higher concentration was fed. The low acid and iodine numbers of the soap extract after the diet with ten per cent triolein added indicate that the soap extract did not contain appreciable quantities of oleic acid. When the twenty per cent diet was fed to these same dogs, oleic acid was apparently present in the soaps. If the effects produced by linseed oil were caused by the rather large per cent of linoleic and linolenic acids present in its glycerides, then it might be assumed that the presence of glycerides of one of these acids or of both of them in the diet would cause constipation. Further investigations will be needed to clarify this point. However, it can be said that neither of these acids was present to any extent in the soap extract because the low iodine and acid numbers exclude such a possibility.