Thanks. I had no idea... I don't know any Jacks. Or maybe it's just not common any more? Of course that's an 'annoyance' with reading old things; they can touch on things that have fallen by the wayside without any fanfare, leaving the modern reader confused. A few months ago I was reading an article where someone was reading 300-year-old records and found the phrase "we'd got up from our first sleep". First sleep? It turns out that at the time, people would typically go to bed at about 21:00, sleep for around two hours, then get up again. It was fascinating to read, actually. Now I've turned this annoyance into a smile :)