LitCharts assigns a color and icon to each theme in Frankenstein, which you can use to track the themes throughout the work.
Family, Society, Isolation
Ambition and Fallibility
Romanticism and Nature
Revenge
Prejudice
Lost Innocence
Summary
Analysis
Written on July 7th, this short letter describes Walton's journey so far as a "triumph." His men remain resolved and loyal, and the weather has been fine, though sheets of ice in the ocean suggest worse conditions may soon threaten. Walton closes his letter with the rhetorical question, "What can stop the determined heart and resolved will of man?"
Walton's confidence reveals his faith in man as an almost divine being. But there is an answer to his question, suggested by the ice in the sea: Nature.