Probably incited by these discoveries, France sent forth an Antarctic expedition, under Dumont d'Irville, in 1837, and England, under Sir James Clark Ross, the discoverer of the northern magnetic pole, in 1839. Simultaneously with these expeditions was organized one by the United States, for which the exceedingly liberal appropriation of $300,000 was made. This last expedition was authorized by the act of Congress of May 18, 1836, "for the purpose of exploring and surveying in the Great Southern Ocean in the important interests of our commerce embarked in the whale fisheries and other adventures in that ocean, as well as to determine the existence of all doubtful islands and shoals, and to discover and accurately fix the position of those which lie in or near the track pursued by our merchant vessels in that quarter." This expedition, the first of its character undertaken by the United States, grew out of the vast capital employed in whaling and trade. The expedition was first organized under Commodore Thomas Ap Catesby Jones, United State Navy, but finally the President of the United States appointed Lieutenant Charles Wilkes to command the squadron, and he was formally assigned to this duty under instructions of Secretary Paulding, dated August 11, 1838. Charles Wilkes was born in New York City, April 3, 1798, and entering the United States Navy as a midshipman at the age of nineteen was promoted to be lieutenant in 1826. He had long served in the department of charts and instruments and was especially qualified for the proposed astronomical and surveying work connected with the expedition.