In 1803, Mr. Jefferson, being then President of the United States, proposed to Congress to send an exploring party to trace the Missouri to its source; to cross the highlands, and follow the best water communication which might offer itself, to the Pacific Ocean. Congress approved the proposal, and voted a sum of money to carry it into execution. Capt. Lewis, who had then been two years with Mr. Jefferson as his private secretary, immediately renewed his solicitations to have the direction of the expedition. Mr. Jefferson had now had opportunity of knowing him intimately, and believed him to be brave, persevering, familiar with the Indigenous American character and customs, habituated to the hunting life, honest, and of sound judgment. He trusted that he would be careful of those committed to his charge, yet steady in the maintenance of discipline. On receiving his appointment, Capt. Lewis repaired to Philadelphia, and placed himself under its distinguished professors, with a view to acquire familiarity with the nomenclature of the natural sciences. He selected, as his companion in the proposed expedition, William Clarke, a brother-officer, known and esteemed by him.

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