The relative clearness of different modes of presenting knowledge may be seen from the following:
If a teacher stated to his pupils that he saw a guava yesterday, possibly no information would be conveyed to them other than that some unknown object has been referred to. Merely to name any object of thought, therefore, does not guarantee any real understanding in the mind of the pupil. If the teacher describes the object as a fruit, fragrant, yellow, fleshy, and pear-shaped, the mental picture of the pupil is likely to be much more definite. If, on the other hand, a picture of the fruit is shown, it is likely that the pupil will more fully realize at least some of the features of the fruit. If the pupil is given the object and allowed to bring all his senses to bear upon it, his knowledge will become both more full and more definite. If he were allowed to express himself through drawing and modelling, his knowledge would become still more thorough, while if he grew, marketed, and manufactured the fruit into jelly, his knowledge of the fruit might be considered complete.
Before passing to a consideration of the various types or classes into which school lessons may be divided, it is necessary to note a certain distinction in the way the mind thinks of objects, or two classes into which our experiences are said to divide themselves. When the mind experiences, or is conscious of, this particular chair on the platform, that tree outside the window, the size of this piece of stone, or the colour and shape of this bonnet, it is said to be occupied with a particular experience, or to be gaining particular knowledge.
=A. Through the Senses.=--These particular experiences may arise through the actual presentation of a thing to the senses. I _see_ this chair; _taste_ this sugar; _smell_ this rose; _hear_ this bell; etc. As will be seen later, the senses provide the primary conditions for revealing to the mind the presence of particular things, that is, for building up particular ideas, or, as they are frequently called, particular notions. Neither does a particular experience, or notion, necessarily represent a particular concrete object. It may be an idea of some particular state of anger or joy being experienced by an individual of the beauty embodied in this particular painting, etc.