James Thurber, in an introduction to “This Petty Pace” (1945), the sole published collection of the artist’s work, describes the young Petty as a “slip of a girl.” Like her husband, she initially preferred to mail in her submissions, but by the nineteen-forties she had become a “common sight” at the magazine’s office, “sitting, cool and almost undismayed, on the edge of a chair.” Thurber reports that she would spend three weeks on a drawing; when she was done, she would say that she hated it and herself. “Everybody else, of course, loves it and her,” Thurber adds, observing that what Petty offered in her work was “not a trick, but a magic. . . . She catches time in a foreshortened crouch that intensifies her satirical effects.”