William Crowell Bray and the discovery of the first periodic homogeneous reaction in 1921

This review is a deep study of the Bray's 1921 paper that reported the observation of the first periodic reaction in homogeneous phase. The paper obtained a general indifference by other chemists and some opposition due to the fact that it seemed to contradict the second Principle of Thermodynamics. Only after the work by Ilya Prigogine and coworkers in the mid-1960s, oscillating chemical reactions in the homogeneous phase have been studied intensively, but Bray died in 1946.