[math-fun] Number Link -- Anything predating Sam Loyd?

I'm writing up some histories of various puzzle types. One of them is Number Link. http://www.nikoli.co.jp/en/puzzles/number_link/ So far as I can tell, the first example of something like this is by Sam Loyd, Puzzleland Park, page 61. http://www.mathpuzzle.com/loyd/cop060-061.html (puzzle) http://www.mathpuzzle.com/loyd/cop346-347.html (answer) After reading Jerry Slocum's The 15 Puzzle, I'm afraid to attribute anything to Sam Loyd, unfortunately. So I thought I might ask around. Has anyone seen other early connect-without-crossing puzzles? Ed Pegg Jr