Queen Sheba's ring

EVERY one has read the monograph, I believe that is the right word, of my dear friend, Professor Higgs-Ptolemy Higgs to give him his full name-descriptive of the tableland of Mur in North Central Africa, of the ancient underground city in the mountains which surround it, and of the strange tribe of Abyssinian Jews, or rather their mixed descendants, by whom it is, or was, inhabited.