Bless you ABCD!   I never understood what was yellow about spleen, but that background gives a flavor for what was meant, rather than it just being an awkward phrase to sing.    And the "rich and rare" allusion as well. I hope you'll keep posting any other commentary that comes to mind on this song, it's certainly of interest.   

I went over to the library at lunch, but the Interlibrary Loan guy was also at lunch. Not sure if I can connect up with him before Christmas vacation days kick in over there. But we shall find a way, one way or another.