London, Henry Colburn, 1839, FIRST EDITION, FIRST ISSUE, publisher's cloth, rebacked replacing original spine. 8vo, uncut, pp xiv [i.e. xii] 615 [1, blank], Addenda 609-629, two folding charts (a little foxing to charts as usual), with 16 pp inserted publisher's advertisements dated August 1839, 8pp prospectus for other publications. First edition, first issue, an attractive copy of the first separate issue of Darwin's Journal, his first formal publication and a classic of natural history travel narrative. It was perhaps the most important scientific voyage ever undertaken, for it gave impetus and direction to all of Darwin's later research. 'The five years of the voyage were the most important event in Darwin's intellectual life and in the history of biological science. Darwin sailed with no formal scientific training. He returned a hard-headed man of science, knowing the importance of evidence, almost convinced that species had not always been as they were since the creation but had…