In the 1730s, Elizabeth Blackwell (1699-c. 1758) found herself penniless, with her ne'er-do-well husband confined to a London debtor's prison. A talented artist, she came up with a unique and ambitious moneymaking scheme: the publication of a new illustrated guide to medicinal plants, including many New World species not depicted in earlier books. Blackwell's Curious Herbal, published between 1737 and 1739, was hailed for its usefulness to doctors...