Begone, or I'll set thee away; begone, ye gnaw-bone, raw-bone rascal!

The portly museum policeman who had been watching him furtively, wondering why a student should sit in front of the "Sacrifice of Lystra" and gnaw lips and nails and moustache, and scowl and glare at that masterpiece, saw him rise suddenly to his feet with an air of resolution, spin on his heel, and set off with a quick step out of the gallery.