Thanks for the explanation, Malcolm. I'd searched for the words "tally" and "doctor", but somehow scrolled over the "Now Doctor Mack" entry in the results--at least twice! I've noticed my Page Down key not infrequently generates spurious duplicate events.

However, nutty's text is still not consistent with either the Ninepenny Marl version nor the older broadside. Witness just the first line:

nutty:
If Doctor Mack no more employs
The burden of me song, Sir

Ninepenny Marl:
If Doctor Mack no more enjoys the burden of me song, sir

Harding B 12(149):
Now Doctor Mack no more employs
The burthen of my song sir,