This little description gives me the impression that they come wealth. Because 18th century houses are very elegant. By mentioning the nod of the head "or polite meaningless words", i took that as a way of showing the manners of the folks, and how respectful they are acting. This just made me think of the emphasis between classes that we've been talking about a lot in class, and I think this could be something hinting at that as well.

To me, this line kind of wraps up everything from the poem. The author is associating nature with the heart and the emotions that come from nature. So, even when standing on a road or some sort of path, you can still "hear it in your heart", which i think is an interesting way of saying it. Why do you hear it, rather than feel it in your heart? Maybe just to emphasize that we experience nature rather than being part of nature?