A Narrative of the Voyages Round the World, Performed by Captain James Cook. With an Account of His Life, During the Previous and Intervening Periods.

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p. 223: Soon after our commander had come to this determination [to sail to the Cape of Good Hope], he demanded of the officers and petty officers, in pursuance of his instructions, the log books and journals they had kept; which were delivered to him accordingly, and sealed up for the inspection of the Admiralty. He enjoined them also, and the whole crew, not to divulge where they had been, till they were permitted to do so by their lordships; an injunction, a compliance with which might probably be rendered somewhat difficult from the natural tendency there is in men to relate the extraordinary enterprises and adventures wherein they have been concerned.