author
A little-known philosophical critic, this author is remembered for taking on Herbert Spencer’s ethical system in a full-length study. The surviving record is sparse, which gives the work itself much of its curiosity and appeal.

by Malcolm (Writer on Herbert Spencer) Guthrie
Malcolm Guthrie is credited as the author of On Mr. Spencer's Data of Ethics, a critical study of Herbert Spencer’s ideas on ethics. Project Gutenberg identifies the work under the author form “Guthrie, Malcolm (Writer on Herbert Spencer),” and describes it as a close examination of Spencer’s attempt to ground ethics in biology, psychology, and sociology.
Beyond that book, reliable biographical information appears to be very limited in the sources available here. Because the historical record is so thin, the strongest way to approach Guthrie is through the text itself: a serious, argumentative work that engages directly with one of the major philosophical systems of its time.
For listeners interested in the history of moral philosophy, Guthrie’s writing offers a window into how Spencer’s ideas were challenged by contemporaries and later readers. Even without a fuller life story, the book stands as evidence of a thoughtful and determined critical voice.