Answer:
At first, you can tell that Muir is very discouraged because he did not reach the end of the swamp by nightfall, but then you can tell that his mood was uplifted when he found the Calypso. By his other uses of wording, you can really tell that he pays attention to little details about nature. Towards the end of the paragraph, you can tell that seeing the Calypso was a life-changing experience since he fairly "cried for joy".
Step-by-step explanation:
this is what i put! i hope this helps :)