The H.M.S. Investigator spent the years 1850–4 in the Western Arctic engaged in a search for the lost expedition of the explorer Sir John Franklin. In this 1857 publication Alexander Armstrong (1818–99), surgeon and naturalist to the ship, gives a first-hand account of life on board during the voyage, as testimony to the 'heroism, devotion, and endurance' of his shipmates. He describes the harsh conditions that the crew had to endure, and argues convincingly that no travel 'more thoroughly tests man's powers of endurance, both morally and physically' than travelling in the Arctic. He also notes that lemon juice proved the most effective remedy against scurvy. Armstrong's natural history research was cut short when the ship was abandoned and his collections left behind, but he includes an appendix listing the animals and birds observed on the voyage, and the Arctic plants collected by a friend and colleague.