The best account of Nemo's character may come from the observations of Professor Pierre Aronnax, the narrator of Twenty Thousand Leagues Under the Sea, who embarks upon the voyage with Nemo when the latter is about forty years of age. He is described as a reticent man throughout the account; tall and swarthy in appearance, with a straight nose and wide-set eyes, an attribute which gives him exceptional range of vision. In the later account given in The Mysterious Island, the aged Captain Nemo is said to sport a long white beard.