Inquiries into Human Faculty and Its Development by Sir Francis Galton: This book is a study of human ability and intelligence, exploring topics such as hereditary and environmental factors in intellectual development, different types of intelligence, and the role of education in shaping intelligence. The book is considered one of the earliest examples of work in the field of psychometrics, which seeks to measure human mental ability through standardized tests. Key Aspects of the Book "Inquiries into Human Faculty and Its Development": Psychometrics: The book is a foundational work on the subject of psychometrics, which seeks to measure human mental ability through standardized tests and other means. Intelligence and Ability: The book explores the factors that contribute to intellectual development and the different types of intelligence that exist in humans. Scientific Method: Galton's work is significant for its application of scientific methods and statistical analysis to the study of human ability and intelligence. Sir Francis Galton was an English scientist and polymath in the nineteenth century. Known for his contributions to a variety of fields, including psychology, genetics, and statistics, Galton is often considered one of the founders of human intelligence testing. In addition to "Inquiries into Human Faculty and Its Development," Galton's other notable works include "Hereditary Genius" and "The Art of Travel."