Meadville, Pennsylvania: Dr. J.D. Stoneroad & Co., c.1889. Advertising flyer (8.75" by 5.5") for Sozone, an antispasmodic for the treatment of asthma as well as "spasmodic croup, whooping cough, or hacking cough of phthisis, and in all spasmodic cases where the pneumogastric nerve is involved" (verso). On the recto is a price list and letter from its founding doctor describing the use and benefits, while on the verso is a group of over fifteen physician testimonials. Very good to fine. Toning, one or two small tears, not touching text. Contemporary ink markings to recto.