156 Washington ave., cor. Camp st. New Orleans, La., April 28, 1891. His ExcellencyBenjamin Harrison, President United States of America, Washington, D. C. Sir: —I have the honor to acknowledge the following: "Executive Mansion,Washington, D. C., January 19, 1891. ProfessorJoseph Jones, Charity Hospital, New Orleans, La. My Dear Sir: —At the President's direction I beg to send you by express, to-day, one vial of Koch's lymph for such use as you may deem wise to make of it. It was forwarded to the President by the American Minister in Germany. Very truly yours, E. W.Halford, Private Secretary." I beg leave respectfully to submit to your Excellency the following brief report on this vial of Koch's lymph. The small vial of Koch's lymph containing about five grams (about seventy-six drops) of a dark brownish red liquid, accompanied by directions for its use, signed by Dr. A. Libbertz,