The author and publishers take pleasure in acknowledging the courtesy of

The Scientific American
The Booklovers Magazine
The Holiday Magazine, and
Messrs. Wood & Nathan Company

for the use of a number of illustrations in this book.

From The Scientific American, illustrations facing pages 16, 48, 78, 80, 88, 94, 118, 126, 142, and 162.

From The Booklovers Magazine, illustrations facing pages 184, 190, 194, and 196.

From The Holiday Magazine, illustrations facing pages 100 and 110.