Caption:
Self portrait by Conrad Martens (1801-1878). Robert FitzRoy said that his great disappointment at losing Earle was 'diminished by meeting Mr Martens at Monte Video, and engaging him to embark with me as my draughtsman.' On the Beagle, the artist Augustus Earle left due to health problems and was replaced by Conrad Martens. From Darwin and the Beagle by Alan Moorhead, page 134.