"On Mr. Spencer's Data of Ethics" is a philosophical treatise written by Malcolm Guthrie, a well-known scholar and writer specializing in the writings of Herbert Spencer. In this book, Guthrie analyzes Spencer's foundations of ethics and examines them in the context of contemporary ethical and moral issues. The book "On the ethical data of Mr. Spencer" analyzes in detail the concepts of ethical principles and moral ideals that underlie the philosophy of Herbert Spencer. The author tries to reveal the essence of the ethical data used by Spencer, and to find out their modern meaning and application. This book is a valuable addition to current research in the field of ethics and morality, and it also inspires readers to think for themselves about important questions of everyday life and moral behavior.