Citations:periodically


 * 1818 — Mary Shelley. Frankenstein.
 * "It was on one of these days, when my cottagers periodically rested from labour — the old man played on his guitar, and the children listened to him — that I observed the countenance of Felix was melancholy beyond expression; he sighed frequently, and once his father paused in his music, and I conjectured by his manner that he inquired the cause of his son's sorrow.