Chatterjee Suniti Kumar (1890-1977), Indian philologist-orientalist. Works on Bengali, Indo-Aryan languages, problems of the origin of Indian civilization, cultural studies. The book is based on two cycles of lectures delivered by the largest Indian linguist Suniti Kumar Chatterjee in 1940. In the first part of the book, the author sets out his views on the history of the development of Indo-Aryan languages. The second part is devoted to the evolution of one of the most important Indo-Aryan languages ​ ​ - Hindi, its history and modern state.