reactor developed further at ORNL without success, but later being developed as nuclear power plant by Rudolf Schulten. Daniels is also known for writing several textbooks on physical chemistry, including Mathematical preparation for physical chemistry (1928), Experimental physical chemistry, co-authored with J. Howard Mathews and John Warren (1934), Chemical Kinetics (1938), Physical Chemistry, co-authored with Robert Alberty (1957). Some of these books went through many subsequent editions until about 1980. He was elected in 1928 a Fellow of the American Association for the Advancement of Science (AAAS). He was awarded the Priestley Medal in 1957. Daniels died on June 23, 1972, from complications from liver cancer. He was survived by his wife, four children, and twelve grandchildren. He was inducted posthumously to the Alpha Chi Sigma Hall of Fame in 1982. Involvement with solar energy Daniels became a leading American expert on the principles involved with the practical utilization of solar energy. He pursued understanding of the heat and the convection that can be derived from it, as well as the electrical energy that could be derived from it. As Director of the University of Wisconsin–Madison's Solar Energy Laboratory, he explored such areas of practical application as cooking, space heating, agricultural and industrial drying, distillation, cooling and refrigeration, and photo- and thermo-electric conversion, and he was also interested in energy storage. In particular, he believed there were many practical applications of solar energy for ready use in the developing world. Daniels was active with the Association for Applied Solar Energy in the mid-1950s. He suggested that AFASE embark upon the publication of a scientific journal, and the first issue of The Journal of Solar Energy Science and Engineering appeared in January, 1957. Later, as Professor Emeritus of Chemistry of the University of Wisconsin–Madison, he led a group of solar scientists who proposed that AFASE be reorganized, that its directors and officers be elected by the membership, and that the name be changed to The Solar Energy Society – all of which was done. He supported solar energy because, as he said in 1955, "We realize, as never before, that our fossil fuels – coal, oil, and gas – will not last forever." One of his classic books is Direct Use of the Sun's Energy, published by Yale University Press in 1964. The book was reprinted in a mass market edition in 1974 by Ballantine Books, after the 1973 oil crisis,