The most important field for the study of economics is not found in books, but in the business world. He who would master even the most elementary problems of economics must study the motives and actions of men as they go about the everyday tasks of making a living. To do this successfully requires a keen power of observation. The student of economics, as he progresses in his thinking on economic subjects, will observe more and more what had formerly escaped his notice. The botanist, when he goes into the country, naturally observes the flowers and trees and other forms of plant life; the geologist watches for unique rock formations; while the student of economics speculates on the fertility of the soil, the distance to markets, the feasibility of employing labor-saving machinery, and the current wages of farm help. We can readily see, therefore, that the field from which the student of economics draws his material for study is wide and far-reaching. Furthermore, the material he finds there comprises not only physical objects such as interest both the botanist and the geologist, but also human nature of every description and even the souls of men. Consequently, judgments under such circumstances are difficult to form, and when formed they are often open to hostile criticism.