Ed, I think that "as many travelers will remember" is an adverb clause
functioning as an adverb of . . . .   I guess I'd say an adverb of
attendant circumstance.  That is, the action of the adverb clause is
attendant to the action in the relative clause it disjoins (i t is in
essentially an "and by the way" relationship with it).  "Which is seated. .
." and by the way, many travelers will remember [this].  "For the
entertainment of tourists is the business of  the place" is also an adverb
clause, but this one functioning as an adverb of reason.
>
>     I have been putting a grammar course on-line, with answer keys, and =
>I'm wondering how members of ATEG would explain "as many travelers will =
>remember" in the following sentence from the opening paragraph of James' =
>"Daisy Miller":
>
>There are, indeed, many hotels, for the entertainment of tourists is the =
>business of  the place, which, as many travelers will remember, is seated =
>upon the edge of a remarkably blue lake--a lake that it behooves every =
>tourist to visit.=20
>
>You might also want to comment on the function of the "for" clause. I will =
>probably include some of your comments as notes =AF disagreements :) =AF =
>to my explanation.
>
>Thanks,
>Ed