The Royal Book of Oz / In which the Scarecrow goes to search for his family tree and discovers that he is the Long Lost Emperor of the Silver Island

In which the Scarecrow goes to search for his family tree and discovers that he is the Long Lost Emperor of the Silver Island, and how he was rescued and brought back to Oz by Dorothy and the Cowardly Lion
ENLARGED AND EDITED BY
ILLUSTRATED BY
Printed in the United States of America
Copyright, 1921 by The Reilly & Britton Co.
All Rights Reserved
Dear Children:
You will remember that, in the front part of Glinda of Oz, the Publishers told you that when Mr. Baum went away from this world he left behind some unfinished notes about the Princess Ozma and Dorothy and the jolly people of the Wonderful Land of Oz. The Publishers promised that they would try to put these notes together into a new Oz book for you.
Well, here it is—The Royal Book of Oz.
I am sure that Mr. Baum would be pleased that Ruth Plumly Thompson, who has known and loved the Oz Stories ever since she was a little girl, has made this new Oz story, with all the Oz folks in it and true to life.
You see I am Mrs. Baum, the wife of the Royal Historian of Oz, and so I know how he feels about everything.
Now, about the story: