The book, 'The Philosophy of health' is an exposition of the physical and mental constitution of man. It briefs about the structure and functions of the body, chiefly with reference to health and disease. The book promotes the perspective of human longevity and happiness and was written by Thoman Southwood Smith. Smith was a minister, physician and social reformer, who considerably improved the health of the poor by linking sanitation with epidemics. He served on the royal commission on children's employment, and was medical representative on the General Board of Health to deal with cholera epidemic of 1848.