I've seen old houses where all circuits enter the breaker box as cables,
but some rooms still have knob-and-tube wiring. (A homeowner who needed
to upgrade wiring for his kitchen may have found the old wiring adequate
in a bedroom.)

That leads to a question that didn't occur to me before. Was there a
proper way to connect K & T to a cable?


*You are better off not touching the K&T wiring. If it works, leave it
alone. If you want to add outlets run new home runs.