New York: Harper & Brothers, 1846. First American edition. Very Good. Two volumes; small octavo (175 mm.). [6, blank], vii, [1, blank], 351, [7, blank]; [4, blank], 323, [12, ads] pages. Publisher's brown cloth, boards decoratively ruled in blind, front boards with gilt central "passing the torch" motif, rear boards with this motif in blind, spines lettered in gilt. Untrimmed copy showing light wear and aging. FIRST AMERICAN EDITION of Darwins first published book and his own account of the Beagles voyage which describes his observations that ultimately laid the foundation to the publication of his major scientific work On the Origin of Species. The voyage of the Beagle has been by far the most important event in my life, and has determined my whole career...I have always felt that I owe to the voyage the first real training or education of my mind; I was led to attend closely to several branches of natural history, and thus my powers of observation were improved (Life…