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CHALLENGE SERIES 49 discussions of nuclear-science principles, research tools and methods, and the projects to which they apply. Leading scientists provide narration. Produced by Ross-McElroy Productions, Chicago, Illinois, for the National Educational Television and Radio Center, under a grant from Argonne National Laboratory. For sale by NET Film Service, at $125.00 per print, including shipping case. THE ALCHEMIST'S DREAM (1965). Transmutation of metals, the dream of the alchemists in the Middle Ages, is shown and explained in its nuclear science con- text by members of the Argonne Chemistry Division. A minute quantity of berkelium is produced by bombarding curium with deuterons from a cyclotron. The berkelium is separated and purified behind the thick walls of a newly constructed hot labora- tory for research with man-made elements. THE ART OF SEPARATION (1962). This film deals with the separation of chemical compounds into basic substances in the purest form possible by the process known as chromatography and with the importance of that pro- cess in chemistry work. Using radiation, the chemist is able to work with much greater speed and ease in the field of chroma- tography. The basic principles and various methods of modern chromatography are explained and demonstrated. Actual separa- tion of a chemical compound is shown. ATOMIC FURNACES (1962). The operation, principles, and scientific applications of nuclear reactors, used as research tools in various projects, are briefly described. Types of research that reactors and associated equip- ment make possible are shown at length. The Gamma Ray Spec- trometer, the Neutron Chopper, and a new reactor designed specifically for high- and low-radiation experiments in biology are also described. A BREEDER IN THE DESERT (1965). Argonne's Experimental Breeder Reactor II at the National Re- actor Testing Station in Idaho is shown in detail, and many of the features and operating characteristics of a large-scale fast breeder reactor are described. The EBR-II Fuel Cycle Facility, first nuclear fuel reprocessing plant completely integrated with a reactor, is shown in operation. BUILDING BLOCKS OF LIFE (1962). Unique fragments of molecules caused by radiation in living sys-