When Mary Poppins left the Banks family that evening in her always unusual, always unpredictable way, spinning skyward in the Merry-Go-Round, the children had one faint hope for her ultimate return. She had taken a Return Ticket. And now, sure enough, Mary, the Great Exception, has returned to delight the hundreds of thousands of children and grown-ups the world over who have become her devoted followers. Wherever the English language is spoken, she will be welcomed; and one day, we hope, she will again have a chance to appear in those lands speaking other languages where in happier years she also extended her unique sway. No character who has become as much of a National Institution as Mary Poppins needs further introduction. But it may be whispered that Mary’s appearance this time is as much of a mystery as before, and her adventures—with the Marble Boy, the Cat that Looked at a King, and all the others—quite as incalculable. Mary Shepard’s drawings again contribute their perfect touch, supplemented in this case in a few spots by a new artist, Agnes Sims, an American, long a devotee of Mary Poppins, who was able to step into the breach when the uncertain Atlantic prevented one small group of pictures from England from arriving in time.