Consider another thing: the content of these pictures, the kind of pictures. How are they determined? They are determined by our social relationships. Do you think the same sort of pictures are in the mind of the Englishman as are in the mind of the American? Do you think the same kind of pictures come into the mind of the Frenchman as come into the mind of the German? There are certain universal pictures, the same for all educated people, but most pictures take on a group character. What are the pictures that come into your minds as librarians? Pictures of your active calling. These pictures are very definite. You have your own phrases, your own language. These phrases and these forms of speech are themselves the labels of mental imagery. Every social group is held together by its phrases. Oh, how we love these phrases and how glibly we repeat them! So too, college professors have their own phrases. What a sesquipedalian terminology it is with which they bewilder the lay mind and overpower the student! How would lawyers get on but for their monopoly of archaic forms of speech? Think of the doctors' terminations, so many of them fatal, in _itis_, which they have invented in the last few years. So every social group determines very largely the conduct of its members by cleverly putting into their minds the imagery that it wishes to have carried out. Why do you dress as you do? Do your clothes represent your individual taste? In some measure, but for the most part you dress as you do because society puts fashion pictures into your heads. You ladies dress as you do because these fashion plates and the women you see upon the street leave a deposit in your mind, a composite picture, and that composite picture works itself out in your own charming and becoming wardrobe. To be sure, as librarians, you have individuality; as librarians, you have a certain personal distinction, but it is, after all, only a variation upon the common modes which you share with all your sisters everywhere. These standards, these ideals, these types, that we talk about are put into our minds by the social groups of which we are members, and we are to a very large extent dominated by these pictures. Do you doubt it? Just examine your mental imagery. How much of that mental imagery have you secured as a result of your own first hand experience? How much of that mental imagery represents original thinking? How much of that psychic panorama have you received ready-made from the society to which you belong?