This work investigates the bibliographic history and publication records of Sir William Petty and John Graunt, two foundational figures in the development of political arithmetic and demography. Geoffrey Langdon Keynes, a noted bibliographer and surgeon, compiles a comprehensive record of the printed works associated with these seventeenth-century scholars. By cataloging editions, variants, and the specific history of the seminal 'Observations on the Bills of Mortality', the text provides a structured framework for understanding the dissemination of early statistical thought. The research serves as a primary reference for scholars interested in the intersection of early modern science and publishing history.

Experts and historians of science regard this volume as a definitive reference for the study of Petty and Graunt's literary output. Readers frequently note the meticulous attention to detail and the clarity of the bibliographic descriptions provided by Keynes.