He was accompanied by Charles Darwin , who by the end of the voyage had become famous in scientific circles as a result of the discoveries he made during it .
Who also collected much of the material that was to underpin Charles Darwin 's evolutionary theories during these travels .
He was accompanied by Charles Darwin , who by the end of the voyage had become famous in scientific circles as a result of the discoveries he made during it , and who also collected much of the material that was to underpin his evolutionary theories during these travels .