“After the mass has been digested in the heated solution, the decoction is decanted, and after being allowed to cool is passed through a suitable filter until the filtrate is clear. I found that by filtering the decoction from four to six times through a carbon filter, I obtained a clear colorless filtrate. This is a solution of secretin and the acid which was used, and the clearness of the solution shows that it is practically free from albumoses, gelatin and other impurities (such as cell tissues, etc.) present in the raw material under treatment.” “To the solution of pure and active secretin prepared as above explained, there is added a suitable quantity of blood serum--say from one-fifth to two per cent. or any equivalent medium--such as albumin solution or a peptone solution--which will aid and sustain the activating power of secretin as provided by the blood. That is to say, any medium having the same power, similar quality or chemical composition that the blood-stream possesses in combining with secretin to stimulate the pancreas. The addition of such a medium to the active secretin solution increases the potency of the secretin and its degree of stability by preventing oxidation or deterioration thereof. If this strengthening or fortifying medium, as it may be properly termed, is alkaline, it performs the additional function of lowering the acidity of the secretin filtrate. It is preferable that the final product be just faintly acid. If desired, the final product may be made into an elixir by the addition of aromatics.” “Any desired strength of secretin solution may be obtained according to the quantity of acid solution. In my experiments I used from ten to fourteen duodena to a pint of acid solution.” “The solution of secretin prepared as above described is characterized by its ability to resist oxidation or deterioration for a sufficient period of time to render the solution available as a commercial article, and is furthermore characterized by freedom from poisonous and irritable chemical substances, whereby the secretin is chemically adapted to the human system to stimulate the pancreas to increased secretion.” “As previously stated, the secretin prepared according to my method may be administered orally to produce the desired physiological action. Of course, if desired, the secretin might be injected intravenously, but this more or less dangerous procedure is not at all necessary, and I merely mention it here to point out that when I refer to the oral administration of my new secretin preparation, I do not mean to exclude its administration by injection.”