This is the most thorough documentation of salubrity based on the writings of Sir William Petty, also known as the quality of life. This book is a novelistic fictional set of memoirs based on letters by 17th century Sir William Petty who worked as a polymath in the sciences. The text describes his life by elaborating on his own words. The author wrote a faux memoir based on letters from William Petty that takes place six months before his death. A man of science and mathematics, this book is important precisely because it details his life experiences and family upbringing, his parenting style, along with how he accomplished everything. It takes a storytelling approach and reads like a novel. The main thesis of the book is that Petty developed the notion of salubrity, or quality of life, which he describes at length in these pages.