Ward first noticed the effects of a hermetically sealed glass container in 1829. He had placed a chrysalis of a
sphinx moth in damp soil at the bottom of a bottle and covered it with a lid. A week later he noticed that a fern and grass seedling had sprouted from the soil. His interest piqued, he saw that evaporated moisture condensed on the walls of the bottle during the day, and ran back down into the soil towards evening, maintaining a constant humidity. The glass case that he used to rear butterflies and grow plants was used widely during the time for introducing plants into the British colonies. His first experiments with plants inside glass cases started in 1830. In 1833
George Loddiges used Wardian cases for shipping plants from Australia and said that "whereas I used formerly to lose nineteen out of the twenty of the plants I imported during the voyage, nineteen out of the twenty is now the average of those that survive". Loddiges was the vice-president of the Horticultural Society and Wardian cases became popular. Scottish lawyer and amateur botanist named
Allan A. Maconochie had created a similar terrarium almost a decade earlier, but his failure to publish meant that Ward received credit as the sole inventor. He attempted to make a greenhouse at the Clapham garden on the principle of the Wardian case. This was however critiqued by
John Lindley in the ''
Gardeners' Chronicle'', who wrote that "when it is opened and shut from day to day, it has no more right to the name [of Wardian case] than a common greenhouse". Lindley also wrote saying that Ward had an inordinate vanity and a desire to be "recognised [as] a second Newton". Dr Ward delivered a lecture on his discovery of a way to preserve plants in 1854 to the
Royal Society at the
Chelsea Physic Garden. He also worked on microscopy and helped in the development of the Chelsea Physic Garden as a member of the board. He was elected a
fellow of the Royal Society in 1852. Nathaniel Bagshaw Ward died at St Leonards in Sussex and is buried in an unmarked grave in
West Norwood Cemetery. He was honoured in 1837, when botanists
William Henry Harvey and
William Jackson Hooker named a species of
moss from South Africa after him,
Wardia. ==References==