In its phase of Salesmanship, the study of human nature along the lines of psychology, becomes a science. From the first to the last Salesmanship is a psychological subject. Every step in the process of a sale is a mental process. The mental attitude and mental expression of the salesman; the mental attitude and mental impression of the customer; the process of arousing the attention, awakening curiosity or interest, creating desire, satisfying the reason, and moving the will-all these are purely mental processes, and the study of them becomes a branch of the study of psychology. The display of goods on the counters, shelves, or windows of a store, or in the hands of the salesman on the road, must be based upon psychological principles. The argument of the salesman must not only be logical but must be so arranged and worded as to arouse certain feelings or faculties within the mind of the prospective buyer-this is psychology. And finally, the closing of the sale, in which the object is to arouse the will of the buyer into final favorable action-this also is psychology. From the entrance of the salesman to the final closing of the sale, each and every step is a psychological process. A sale is the action and reaction of mind upon mind, according to well established psychological principles and rules. Salesmanship is essentially a psychological science as all must admit who will give to the subject a logical consideration. To those who object to the term "psychology" because of its newness and unfamiliar sound, we do not care to urge the term. Let such cling to their old term of "human nature," remembering however that "human nature" is essentially mental. A dead man, a man asleep or in a trance, or an idiot, manifests no "human nature" in the sense the word is generally used. A man must be alive, wide awake, and in possession of his senses, before he is able to manifest "human nature," and before his "human nature" may be appealed to according to the well-known principles. "Human nature" cannot be divorced from psychology, try as we may.We do not for a moment wish to imply that Salesmanship is entirely dependent upon a knowledge of psychology. There are other factors concerned. For instance, the salesman must possess a practical knowledge of his goods; of the seasons; of the trend of fashion in relation to his line; of the adaptability of certain goods for certain sections. But, waiving for the moment the point that even these are concerned with the mind of people at the last, and admitting that they may be considered as independent of psychology, all of these points will avail nothing if the salesman violates the psychological principles of the sale. Give such a man the best goods, of the best house, with a thorough knowledge of the requirements of the trade and the goods themselves, and send him forth to sell those goods. The result will be that his sales will fall below the mark of a man far less well equipped in other respects but who understands the psychology of salesmanship, either intuitively or else by conscious acquirement.Inasmuch as the essence of Salesmanship is the employment of the proper psychological principles, does it not seem imperative that the salesman should know something of the Mind of Man-the instrument upon which he must play in plying his vocation? Should not the salesman possess the same kind of knowledge of his instrument as does the musician, the mechanic, the artisan, the artist? What would be thought of one who would expect to become an expert swordsman without a knowledge of the principles of fencing, or of one who would expect to become a boxer without mastering the established principle of boxing? The instruments of the salesman are his own mind and the mind of his customers. He should acquaint himself thoroughly with both.