

Indoor Wardian Case (from Ward's 1852 book)

The fern case was discovered accidentally in 1827 by Dr. Nathaniel Ward, a London physician with a passion for botany. Dr. Ward built a fern rockery in his backyard, but the ferns kept dying, poisoned by the fumes from the city's factories. Ward was also studying moths and caterpillars and, while experimenting with a cocoon in a covered jar for observation, he noticed that several plants had grown in the bit of soil at the bottom of the jar. Among the bottled plants was a fern and, unlike the ferns in his garden, it looked healthy; Dr. Ward concluded that plants could flourish in London if they could be protected from the city's polluted air. Ward pursued his discovery in miniature greenhouses, which he named fern cases, and which are now known as Wardian cases or terrariums.