Dr. Ward was a physician with a passion for botany. His personally collected herbarium amounted to 25,000 specimens. The ferns in his London garden in Wellclose Square, however, were being poisoned by London's air pollution, which consisted heavily of coal smoke and sulphuric acid.
Dr. Ward also kept cocoons of moths and the like in sealed glass bottles, and in one, he found that a fern spore and a species of grass had germinated and were growing in a bit of soil. Interested but not yet seeing the opportunities, he left the seal intact for about four years, noting that the grass actually bloomed once. After that time however, the seal had rusted, and the plants soon died from the bad air.[1] Understanding the possibilities, he had a carpenter build him a closely fitted glazed wooden case and found that ferns grown in it thrived.