The first half of the 19th century was a golden age for illustrated scientific publishing. Advances in steel engraving and hand-coloring allowed naturalists and anatomists to document the world with a precision that earlier printing methods couldn't match, and the results were often as visually arresting as they were informative. Natural history, medicine, and zoology all produced work in this period that holds up as fine draftsmanship by any standard. The period originals here come from that tradition.