In 1902, the journal split into three sections Section A: Mathematical and Physical Sciences, Section B: Biological, Geological, and Chemical Science and Section C: Archaeology, Culture, History, Literature. Section A is now published as Mathematical Proceedings of the Royal Irish Academy since 1998, and Section B is now published as Biology and Environment: Proceedings of the Royal Irish Academy. Section C is now Proceedings of the Royal Irish Academy: Archaeology, Culture, History, Literature.
