Facsimile edition of the book "Demography of Catalonia" by Professor Josep Ma. Tallada, printed in 1918. This is a brief work that provides a global (demographic, but also social and economic) perspective of the country in the early 20th century. The author was the manager of the Social Museum, one of the institutions prior to Idescat, and was also a statistics lecturer at the Public Administration School of the Mancomunitat. This work was published to celebrate the 20th anniversary of the Statistical Institute of Catalonia.