This was on the left-hand wall as one entered the room. The right-hand wall was no less thickly inscribed, and Willett felt a start of recognition as he came upon the pair of formulae so frequently occurring in the recent notes in the library. They were, roughly speaking, the same: with the ancient symbols of "Dragon's Head" and "Dragon's Tail" heading them as in Ward's scribblings. But the spelling differed quite widely from that of the modern versions, as if old Curwen had had a different way of recording sound, or as if later study had evolved more powerful and perfected variants of the invocations in question. The doctor tried to reconcile the chiselled version with the one which still ran persistently in his head, and found it hard to do. Where the script he had memorised began "Y'ai 'ng'ngah, Yog-Sothoth", this epigraph started out as "Aye, cngengah, Yogge-Sothotha"; which to his mind would seriously interfere with the syllabification of the second word.