This book is primarily a linguistic description of the Maithili language as it was spoken in the early 18th century in the Nepalamandala (present-day central Nepal), and also includes an explanation of how this southern language came to be used in the centre of the country. However, the linguistic analysis is based largely on the text of a play, the Parsuramopakhayana-nataka, which was written in the Newari script. The original text of the play is reprinted in the book, and is one of a few extant examples of the Newari script being applied to the Maithili language.