What I thought cute was the play on the pronunciation — the earl was Scottish; so it’s likely he pronounced Bute as Boot, like Dubya with Bush. The technique is also peculiar — sometimes images just stand for themselves — city, bridge, hole, quill (in the bottom of the page), heart (right column second line) (hello emojis!); sometimes it’s homonyms (well); sometimes it’s a part of a word (well for whell in dwell; when with a hen); sometimes just a shape resembling a letter (i?). It took me a long time to figure out that the frequently recurring shape that I took for a finger is actually a toe, standing for "to".
Still have no clue about many lines.