" Left to herself, the serpent now began
To change; her elfin blood in madness ran,
Her mouth foam’d, and the grass, therewith besprent,
Wither’d at dew so sweet and virulent;
Her eyes in torture fix’d, and anguish drear, 150
Hot, glaz’d, and wide, with lid-lashes all sear,
Flash’d phosphor and sharp sparks, "

― John Keats , Complete Works of John Keats