From 1768 until 1779–80, in a series of remarkable voyages of circumnavigation, Captain James Cook ‘fixed the bounds of the habitable earth, as well as those of the navigable ocean, in the southern hemisphere’. During these voyages, Cook sailed further, and further out of sight of land, than anyone had previously done. He discovered – or rediscovered – numerous islands. He demonstrated how the new ‘time keeper’ (chronometer) might be used to determine longitude much more accurately than ever before. He showed how scurvy might be controlled. He encountered and left detailed descriptions of peoples about whom Europeans had little or no knowledge. The scientists who sailed with him made very extensive collections of birds, animals, fish and plants, and obtained a wealth of information about the atmosphere and the oceans, all of which contributed significantly to the emergent modern scientific disciplines. In short, as one of his companions observed after his death, ‘no one knew the value of a fleeting moment better and no one used it so scrupulously as [Cook]. In the same period of time no one has ever extended the bounds of our knowledge to such a degree.’