Abstract
In 1913 an emblematic Chemistry international meeting was held in Brussels, sponsored by the industrialist Ernest Solvay to celebrate the fiftieth anniversary of the founding of their first factory. This was the third meeting of the International Association of Chemicals Societies (IACS), predecessor to the IUPAC (International Union of Pure and Applied Chemistry). This association was founded two years before to promote communication and exchange of information among scientists, especially chemists, internationally, promoting the standardization of nomenclature and symbols. Aspects of this meeting (origin, objectives, conclusions . . .) and biographical data of the representatives of various scientific societies, among which are three Nobel Laureates in Chemistry (Ramsay, Ostwald and Werner) and three Spaniards (Hauser, Casares and Rodríguez Mourelo) are summarized.