Hieroglyphics of Horapollo, tr. Alexander Turner Cory, [1840], at sacred-texts.com
When they would symbolise a man previously deranged in his intellects, but afterwards becoming sane, and bringing a degree of regularity into his life, they depict a SYRINX; for it is soothing, and calls to remembrance things that have been pleasurably done; and it produces a very regulated sound.