View of a business card for W. Niles Stevens. Printed on front: "W. Niles Stevens, sole agent for Dr. John Tripp's Blood Purifier. Detroit, Mich. Suite 26 & 27 Whitney Opera House Blk." Printed on back: "Dr. John Tripp's Blood Purifier. A safe, sure and swift specific for all forms of blood poison, a certain and complete cure for scrofula and all diseases caused by impure and impoverished blood. Office hours: 9 to 11 a.m., 2 to 3 p.m., 7 to 8 p.m., Sunday, 12m to 2 p.m."