Answer:
Based on what I'm reading, it seems that the tone in the first two letters is apprehension. In letter 1, he is more hopeful for what the future holds, and in letter 2, he seems to get more impatient in finding someone who shares his interests. He befriends a man taken in by his ship, which parallels the relationship between man and monster, and suggests that the two may not be so different, hence their developed friendship and trust in each other.
Hope this helps, good luck!
(this is somebody elses answer but i do hope it helps)
