THE BOOK SHELF 349 



The book contains many illustrations and is as attractive as it is 

 instructive. I am sure we are all grateful to Dr. Hale for giving 

 us this clear and valuable resume" of the recent investigations in 

 the field of astronomy, and we are pleased to note that he dedicates 

 the volume to his wife. 



The Sky Movies: Gaylord Johnson. 170 pp. with over 100 

 pictures. The MacMillan Company. Price $1.50. 



The author of this attractive little volume has taken great 

 pains to make children understand our earth as a globe, its 

 movements, the moon, its relation to the earth and its move- 

 ments. It begins like a fairy story with a fairy ring presided over 

 by a wise little Puck who gives the children a lovely story about 

 Istar, the Moon Princess, but also gives them much valuable 

 information. The scene is laid on grandfather's farm and the 

 actors are Peter and Paul, twins, and Betty, their sister. There 

 are also very nice grandparents and a sympathetic Uncle Henry. 

 However, despite the fairy tales and the mind pictures spread on 

 cobwebs, the book is filled with practical information of the most 

 reliable sort. The illustrations are most helpful and interesting 

 especially valuable are the series of photographs of the moon in 

 all its phases taken from photographs made at the Yerkes Observa- 

 tory. How we prove that the world spins like a top, how to 

 make and understand a sun-dial, how the star clock tells time, 

 the arrangements and movements of the planets made into a 

 play; all these and many other things are explained, illustrated 

 .and made plain in this attractive book. 



