ABSTRACT
The student taking up different text-books of psychology will find various definitions of the subject, and none that we can offer will meet with universal acceptance among psychologists. Psychology is the youngest member of the family to assert its independence, being yet indeed little more than a fledgling. A more significant reason for the lack of general agreement as to the definition of psychology is that a definition often does more than point to the concrete facts with which the science is concerned—it may imply some theory as to the essential nature of those facts. The essential nature of the facts with which psychology deals and its precise relation to other sciences are more likely to be revealed in patient experiment than in mere debate. Psychology concerns itself not with this or that gland or muscle, but with what the animal does.
