The tone is communicated according to the passage through figurative speech.
In the passage, it can be seen that the author used similes. For example, "How long I sat beside Calypso I don't know hunger and wariness vanished, and only after the sun was low in the west, I splashed on through the swamp, strong and exhilarated as if never more to feel any mortal care."
Also, the passage uses personification. For example, "When I told her I had entered it in search of plants and had been in it all day, she wondered how plants could draw me to these awful places, and said, "it's God's mercy ye ever get out."
Therefore, in conclusion, the authors communicate through figurative language according to this passage.
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