Now the science of aesthetics is an attempt to do in a systematic way what thoughtful art lovers have thus always been doing haphazardly. It is an effort to obtain a clear general idea of beautiful objects, our judgments upon them, and the motives underlying the acts which create them,--to raise the aesthetic life, otherwise a matter of instinct and feeling, to the level of intelligence, of understanding. To understand art means to find an idea or definition which applies to it and to no other activity, and at the same time to determine its relation to other elements of human nature; and our understanding will be complete if our idea includes all the distinguishing characteristics of art, not simply enumerated, but exhibited in their achieved relations. How shall we proceed in seeking such an idea of art? We must follow a twofold method: first, the ordinary scientific method of observation, analysis, and experiment; and second, another and very different method, which people of the present day often profess to avoid, but which is equally necessary, as I shall try to show, and actually employed by those who reject it. In following the first method we treat beautiful things as objects given to us for study, much as plants and animals are given to the biologist. Just as the biologist watches the behavior of his specimens, analyzes them into their various parts and functions, and controls his studies through carefully devised experiments, arriving at last at a clear notion of what a plant or an animal is--at a definition of life; so the student of aesthetics observes works of art and other well-recognized beautiful things, analyzes their elements and the forms of connection of these, arranges experiments to facilitate and guard his observations from error and, as a result, reaches the general idea for which he is looking,--the idea of beauty. A vast material presents itself for study of this kind: the artistic attempts of children and primitive men; the well-developed art of civilized nations, past and present, as creative process and as completed work; and finally, the everyday aesthetic appreciations of nature and human life, both by ourselves and by the people whom we seek out for study. Each kind of material has its special value. The first has the advantage of the perspicuity which comes from simplicity, similar for our purposes to the value of the rudimentary forms of life for the biologist. But this advantage of early art may be overestimated; for the nature of beauty is better revealed in its maturer manifestations, even as the purposes of an individual are more fully, if not more clearly, embodied in maturity than in youth or childhood.