The Beagle Diary was later used to write Darwin's famous book 'Voyage of the Beagle' (1839). The narrative of the surveying voyages of His Majesty's Ships Adventure and Beagle between the years 1826 and 1836. Darwin describes each day of the voyage, some in intimate detail, during the Beagle's circumnavigation of the globe.
4th September 1836
Cape Verde Islands
We were all very glad in the evening of the 4th to wish farewell to the irregular mountains of St Jago, as they disappeared in the evening shades. I confess, I feel some good will to the Island; I should be ungrateful if it was otherwise; for I shall never forget the delight of first standing in a certain lava cavern & looking at the swell of the Atlantic lashing the rugged shores.