My purpose in writing on the blog is not to tell you what to think, but rather to point out things I think you should consider with that in mind:
1. This story has an unusual structure because it is a first-person narrative about someone telling a first-person narrative. The narrator (so far unnamed) is telling the story Charlie Marlow told them on the dock.
2. There are lots of images of the river before Marlow tells his story. Those images are about the Thames.
3. Romans? What are they about?
4. River as snake.
5. Pay attention to the job history of Marlow--and what his life story seems to be.
6. Britain v. Continent
8. Go back and note Marlow's first words.: "And this also has been one of the dark places of the earth."
9. Fresleven--the Dane. That story (though small) seems important.
10. The whited sepulchre--an allusion
11. The two women knitting.
12. What the doctor does...measuring his head? Why? Madness? Why?
13. The aunt.
What I am adding:
14. There is a great deal of connection between earth, water, and sky it seems to me.
15. There is a sense of peace, perfection, diaphanous.
16. The "venerable" stream evokes a great spirit of the past.
17. The narrator describes Marlow as a yellow, ascetic idol.