Left: Sir Joseph Dalton Hooker, 1864. Right: David Lyall, 1862.
"Capt. Crozier wishes me particularly to tell you that all the botanical collections of the Terror were made by Lyall," Joseph Dalton Hooker wrote to his father, the eminent botanist Sir William Jackson Hooker, in December 1843 from the Falkland Islands, where James Clark Ross's expedition was preparing for a third voyage towards Antarctica. "The latter often walks with me & though no Botanist, endeavours to make good collections, in which I am glad to hear you say he has succeeded."
Hooker and David Lyall, the assistant surgeons of HMS Erebus and HMS Terror, were two of the youngest members of the Antarctic expedition: both turned twenty-two in June 1839, a few months before the expedition left England, and were serving in their first appointment on a Royal Navy ship. Hooker, who had originally hoped to be the expedition’s naturalist, had begun attending his father’s lectures at Glasgow University when he was seven, and saw the expedition as an opportunity to discover new plants in previously unexplored regions. Lyall had less of a scientific background: after leaving an arts course at an Aberdeen college without finishing the degree, he obtained a surgeon’s license from the Royal College of Surgeons in Edinburgh (though he would not be awarded an MD until 1844) and served on a Greenland whaling ship before joining the navy in June 1839. It appears to have been the Antarctic expedition, and his association with Hooker in particular, that first interested Lyall in botany. Writing up the first volume of his Flora Antarctica in 1844, Hooker praised "my zealous friend and co-operator, Dr. David Lyall," and named an entire genus after him (Lyallia, a cushion plant endemic to the Kerguelen Islands).
The two surgeons’ professional paths diverged after the expedition returned to England in 1843. With the exception of a pair of sinecure appointments while he worked to publish the expedition’s botanical results, Hooker had little further involvement with the navy. He went on to a brilliant career as a botanist, developing a close friendship with Charles Darwin and succeeding his father as the director of the Royal Botanic Gardens at Kew in 1865. Lyall continued as a naval surgeon, though he retained a keen interest in botany. Through Hooker's father's patronage, he was appointed surgeon on HMS Acheron's survey of the New Zealand coast from 1847 to 1851, giving him an opportunity to closely study the island's plants. He also collected a wide-ranging herbarium while working on an official survey of the land border between the United States and British Columbia, which took him from the Pacific Ocean to the Rocky Mountains between 1857 and 1862.
Hooker and Lyall remained friends and correspondents until Lyall’s death from complications following a broken arm in 1895, aged 77. Hooker, who wrote obituaries for him in two different journals, noted that they had been the last two surviving officers of the Antarctic expedition. He spent the last years of his life offering advice to a new generation of Antarctic explorers, and died in December 1911, aged 94.
Sources:
Letter from Joseph Dalton Hooker to William Jackson Hooker, December 5th, 1842. https://jdhooker.kew.org/p/jdh/asset/1920
Joseph Dalton Hooker. The Botany of the Antarctic Voyage of H.M. Discovery Ships Erebus and Terror in the Years 1839-1843 Under the Command of Captain Sir James Clark Ross. 3 vols. London: Reeve, 1847-60.
———. “David Lyall, M.D.” Journal of Botany, British and Foreign 33 (1895): 209-11.
———. “Dr. David Lyall.” The Geographical Journal 5, No. 6 (June 1895): 602-03.
Leonard Huxley. The Life and Letters of Sir Joseph Dalton Hooker. 2 vols. London: John Murray, 1918.
Andrew Lyall. “David Lyall (1817-1895): Botanical explorer of Antarctica, New Zealand, the Arctic and North America”. The Linnean 26, No. 2 (2010): 23-48.
Images:
Ernest Edwards. “Sir Joseph Dalton Hooker”. 1864, albumen print. National Portrait Gallery, London, United Kingdom. (x)
Maull & Polyblank. “Dr. David Lyall”. 1862, photograph. The Linnean Society of London, London, United Kingdom. (x)