We hear of the evolution of chemical communications, how chemists tell other chemists of their research, starting with Henry Oldenburg in 1665, who published summaries of Royal Society meetings. We learn of the first truly chemical journals in the 1780s, the splitting into chemical subdivisions, private chemical journals, and then journals published by chemical societies. Finally, we also talk about what constitutes a professional chemical communication, and the types of chemical communications.Support the show Support my podcast at https://www.patreon.com/thehistoryofchemistry Tell me how your life relates to chemistry! E-mail me at steve@historyofchem.com Get my book, O Mg! How Chemistry Came to Be, from World Scientific Publishing, https://www.worldscientific.com/worldscibooks/10.1142/12670#t=aboutBook