The only thing I would worry about with a house that old is possible insect damage that has gone unnoticed. I wouldn't worry so much about how it was built, since back then they had better lumber and normally built stronger than needed.
Do you live in an area prone to termites, carpenter ants(Camponotus pennsylvanicus...You think we have them in PA? )
or powder post beetles? If you have ever had any of those in the past, I would just take a good look around and make sure there are no signs of damage.