“Of course, they have to go back to their original owners. But this letter says that the Dutch government wants us to come to Holland as their guests as a reward for finding those paintings.” [Illustration: _These two paintings “The Lacemaker” and “The Smiling Girl” were thought to have been by Vermeer. A series of tests, including some of those described in this booklet, showed that the paintings are fairly old. However, some of the materials used are not typical of Vermeer, and the pictures are now thought to have been painted by a follower of the artist._] “That’s great!” said Bill. “Looks like we’re getting something out of finding that box after all.” “Yes,” said Dad. “And don’t forget the other unidentified paintings may also be genuine. We’ve proved that one is a fake, the experts believe that three of the others are copies, and then there are the two that might be Sisleys and are only waiting for a method to prove it. And we have one more that science managed to prove was really old. I’m sure that in a few years methods will be developed to tell us exactly who painted it. “And now let’s make arrangements for our trip to Holland.” Reading List _About Atomic Power for People_, Edward and Ruth S. Radlauer, Childrens Press, Chicago, Illinois 60607, 1960, 47 pp., $2.50. Grades 5-9. _All About the Atom_, Ira M. Freeman, Random House, Inc., New York 10022, 1955, 146 pp., $2.50. Grades 4-6. _Atoms at Your Service_, Henry A. Dunlap and Hans N. Tuch, Harper and Row, Publishers, New York 10016, 1957, 167 pp., $4.00. Grades 7-9. _Carbon-14 and Other Science Methods that Date the Past_, Lynn and Gray Poole, McGraw-Hill Book Company, New York 10036, 1961, 160 pp., $3.95. Grades 9-12. _Experiments with Atomics_ (revised edition), Nelson F. Beeler and Franklyn M. Branley, Crowell Collier and Macmillan, Inc., New York 10022, 1965, 160 pp., $3.50. Grades 5-8. _The Fabulous Isotopes: What They Are and What They Do_, Robin McKown, Holiday House, Inc., New York 10022, 1962, 189 pp., $4.50. Grades 7-10. _Inside the Atom_ (revised edition), Isaac Asimov, Abelard-Schuman, Ltd., New York 10019, 1966, 197 pp., $4.00. Grades 7-10. _Introducing the Atom_, Roslyn Leeds, Harper and Row, Publishers, New York 10016, 1967, 224 pp., $3.95. Grades 7-9. _Our Friend the Atom_, Heinz Haber, Golden Press, Inc., New York 10022, 1957, 165 pp., $4.95 (out of print but available through libraries); $0.35 (paperback) from Dell Publishing Company, Inc., New York 10017. Grades 7-9. _Radioisotopes_, John H. Woodburn, J. B. Lippincott Company, Philadelphia, Pennsylvania 19105, 1962, 128 pp., $3.50. Grades 7-10. _The Story of Atomic Energy_, Laura Fermi, Random House, Inc., New York 10022, 1961, 184 pp., $1.95. Grades 7-11.