"Human Nature" is a term most frequently used and yet but little understood. The average person knows in a general way what he and others mean when this term is employed, but very few are able to give an off-hand definition of the term or to state what in their opinion constitutes the real essence of the thought expressed by the familiar phrase. We are of the opinion that the first step in the process of correct understanding of any subject is that of acquaintance with its principal terms, and, so, we shall begin our consideration of the subject of Human Nature by an examination of the term used to express the idea itself.