Alexander explores the Rio Negro  (May 1833)
	On May 1st 1833  Mr. Usborne and six others took a boat to survey the Rio Negro until the end of the month. The Beagle left the Rio Negro on September 1st
and the coast of Peru (September 1835) September 6th 1835: Time did not permit FitzRoy to continue his survey of Peru, so he bought a vessel of 35 tons named Constitution for 400 pounds. Alexander Usborne, Charles Forsyth, E. Davies (of the Blonde), seven seamen and one boy were transferred to this boat and, saying farewell to the Beagle, continued the survey north along the coast of Peru.