Colloquies is a book written by John Slade and published in 1838. The book consists of imaginary conversations between a phrenologist and the shade of Dugald Stewart. The phrenologist discusses the science of phrenology, which is the study of the shape and size of the human skull as an indicator of mental faculties and character traits. Dugald Stewart, a Scottish philosopher, engages in a dialogue with the phrenologist and offers his own thoughts...