Warner's Safe Yeast. Precocious youngster: Mamma, what's the matter with the baby? Mamma: Ah, darling, baby's very sick, I'm afraid we won't be able to raise him. Precocious youngster: Try this mamma, Dinah says Warner's Safe Yeast is the best thing she knows of to raise him.

Trade cards were one of the most prevalent forms of advertising in the U.S. from around 1875 to 1900. They had their origin in England in the 1700s with tradesmen advertising their wares. The advent of lithography in the 1870s made it possible to mass-produce them in color. The Philadelphia 1876 Centennial Exhibition sparked the beginning, as many were passed out at that event.