I'm starting to just call those 1900-1920 homes, post victorians. They aren't quite true foursquares, but have most of the elements, but they are more symmetrical and less ornamented than vics.
Great commont on K&T. Modern wirign for example uses wire nuts to more conenctions in junciton boxes. Prior to plastic, the connects will be soldered and then taped. The tape is almost like mastic and you can barely get it off even if you wanted. I trust my old wiring more than any done afterwards and up to the time I moved in. In my case, it's post K&T (althogh some people call anything that's not moden romex style K&T) that rubber insulated and then cotton cloth wrapped and inside EMT (flexible metal) conduit. Fixtures are hung using heavy cast 1/2" treaded fittings that can support the fixtures that often weighed over 20lbs.
Actually the EMT is probably grounded anyway, since it eventually conencts back to the service panel. I'd trust it to last another 50 years more than I'd trust modern paper insulated vinyl sheathed Romex to last even 40.
As mentioned, downsize AL fuses to 15 Amps first thing, unles it's a dedicated circuit. (not common in ould houses) and you can inspect the wires and see that it's a larger gauge. Most old wiring is only something like 16 gauge and can only support 15 Amps. Repalce a fused main disconnect with a new breaker panel if you can't afford a full upgrade and pull new dedicated circuits to major appliances like your furance, AC, refrigerator, etc. and entertainment centers (you largest loads)