This book does what Tools of Tomorrow by J. N. Leonard just failed to do. It is exciting reading, following the scarcely glimpsed possibilities of modern science -- biology, chemistry, physics, engineering, agriculture -- showing what is yet to be done and how it is within the bounds of immediate possibility. He goes further, showing how these changes might effect our social, economic, industrial structure, the dangers and responsibilities, the challenge, the threat. He holds small brief for modern achievements, which he feels should have gone farther toward solving the ills of modern life. He writes it all in such A B C language that the veriest novice in science, granted an inquiring mind and keen intelligence, will be fired with curiosity and the urge to go further. A book like this affords a good opportunity to the bookseller to make some plus sales by displaying with books in allied subjects. Sell to older boys and girls as well as the adults for whom it is written. The author is associate professor of Chemical Engineering at Yale.