"The Analysis of Mind" by Bertrand Russell is a philosophical book that explores the nature of the mind and consciousness. In this work, Russell argues that mental phenomena can be analyzed and understood through the principles of logic and mathematics. He posits that the mind can be divided into two categories: the "conscious mind" and the "unconscious mind". The conscious mind is the part of the mind that we are aware of, while the unconscious mind is the part that we are not aware of but which still influences our behavior.