"as of one who should say: 'Dr Livingstone, I presume?'"

Photographic reproduction of a lantern slide depicting the meeting of Dr. Livingstone and H.M. Stanley
Public DomainPhotographic reproduction of a lantern slide depicting the meeting of Dr. Livingstone and H.M. Stanley - Credit: unknown
 Dr David Livingstone (1813-1873) was a Scottish missionary, explorer, and anti-slavery campaigner who travelled extensively in central and southern Africa.

When he lost contact with the outside world, the British journalist and explorer Henry Morton Stanley (1841-1904) was sent by the New York Herald newspaper to find him. H.M. Stanley found Dr. Livingstone in November 1871 in the town of Ujiji on the shores of Lake Tanganyika in present-day Tanzania. He is reputed to have greeted him with the words, 'Dr Livingstone, I presume?"

The greeting subsequently became a popular humorous catchphrase.