Thanks everyone for their input.
Can you quantify the amount of sloping you're looking at?
It's probably an inch or 3/4 inch drop over a couple of feet, and then it levels out after that. It's highest near the chimney, slopes down from there, and then is level near the outside walls of the house. One support girder in the basement goes into the chimney. Where it enters, it has been raised up with a shim (some thin wood inserted under the girder.) I'm developing an opinion that it was too low in that area, so someone corrected the problem, but they over-corrected.
Try to get a feel for the cost of a worst case senario and see if it is something you can stomach.
I could come up with the cash, but I'd be very, very unhappy about it.
I'm almost inclined to say that if it has stood for 100 years, and there is no water or termite damage, then it is probably okay.
Thanks I'm also sloping in this direction. I'm going to talk it over with my wife's Godfather tonight. He's a real estate developer and has some experience with older homes as well.
Can you live with the floors as they are?
Absolutely. My only concern is that it may be evidence of a worsening problem.