In 1768, with a group of scientists, Cook set out on his first expedition, sailing around Cape Horn. The immediate purpose was to observe the transit of the planet Venus from the vantage point of Tahiti. On his voyage, which continued till 1771, the party went on to explore the coast of New Zealand and to chart the eastern coast of Australia. As a result of this expedition, Cook was promoted to commander in the navy and was sent with two ships to determine whether there was a continent at the south extremity of the earth. Although they did not sight Antarctica, the explorers were the first to cross the Antarctic Circle. During this expedition of 1772-75, Cook sailed around the world far to the south, mapping the South Pacific and other southern latitudes much as they are known today. By providing the crews with sufficient vegetables, Cook proved that scurvy, a desease caused by lack of vitamin C, need no longer plague men on long voyages.
Cook was promoted as captain and on his third voyage of discovery, 1776-78, undertook a search for the Northwest Passage - a linking of the Atlantic and the Pacific oceans by way of Arctic regions. He approached from the Pacific side and discovered the Sandwich (Hawaiian) Islands. Although he found no passage through the ice, Cook explored the northwest coast upto Bering Strait. After his return to Hawaii, he was killed by a native because of a misunderstanding over a missing boat. The journals of Cook and his associates are among the most entertaining accounts of discovery and scientific investigation.
