Information on the currents of the Pacific Ocean was gathered by explorers of the late 18th century, including James Cook and Louis Antoine de Bougainville. James Rennell wrote the first scientific textbooks on oceanography, detailing the current flows of the Atlantic and Indian oceans. During a voyage around the Cape of Good Hope in 1777, he mapped ""the banks and currents at the Lagullas"". He was also the first to understand the nature of the intermittent current near the Isles of Scilly, (now known as Rennell's Current).