The tone that can be found on the excerpt from Homesick is about frustration.
It should be noted that a tone on literature simply means the mood that's implied based on the choice of words of the author and how the text makes the readers feel.
From the complete question, the tone that can be found on the excerpt from Homesick is about frustration. The author stated that he hated himself for not staying in Rome. He was frustrated and homesick.
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