Chapter 46

CLASSIFICATION OF KNOWLEDGE

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.

ACQUISITION OF 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.

=B. Through the Imagination.=--Secondly, by an act of constructive imagination, one may image a picture of a particular object as present here and now. Although never having had the actual particular experience, a person can, with the eye of the imagination, picture as now present before him any particular object or event, real or imaginary, such as King Arthur's round table; the death scene of Sir Isaac Brock or Captain Scott; the sinking of the _Titanic_; the Heroine of Verchères; or the many-headed Hydra.

=C. By Inference, or Deduction.=--Again, knowledge about a particular individual, or particular knowledge, may be gained in what seems a yet more indirect way. For instance, instead of standing beside Socrates and seeing him drink the hemlock and die, and thus, by actual sense observation, learn that Socrates is mortal; we may, by a previous series of experiences, have gained the knowledge that all men are mortal. For that reason, even while he yet lives, we may know the particular fact that Socrates, being a man, is also mortal. In this process the person is supposed to start with the known general truth, "All men are mortal"; next, to call to mind the fact that Socrates is a man; and finally, by a comparison of these statements or thoughts, reason out, or deduce, the inference that therefore Socrates is mortal. This process is, therefore, usually illustrated in what is called the syllogistic form, thus:

All men are mortal. Socrates is a man. Socrates is mortal.

When particular knowledge about an individual thing or event is thus inferred by comparing two known statements, it is said to be secured by a process of _deduction_, or by inference.

GENERAL KNOWLEDGE

In all of the above examples, whether experienced through the senses, built up by an act of imagination, or gained by inference, the knowledge is of a single thing, fact, organism, or unity, possessing a real or imaginary existence. In addition to possessing its own individual unity, however, a thing will stand in a more or less close relation with many other things. Various individuals, therefore, enter into larger relations constituting groups, or classes, of objects. In addition, therefore, to recognizing the object as a particular experience, the mind is able, by examining certain individuals, to select and relate the common characteristics of such classes, or groups, and build up a general, or class, idea, which is representative of any member of the class. Thus arise such general ideas as book, man, island, county, etc. These are known as universal, or class, notions. Moreover, such rules, or definitions, as, "A noun is the name of anything"; "A fraction is a number which expresses one or more equal parts of a whole," are general truths, because they express in the form of a statement the general qualities which have been read into the ideas, noun and fraction. When the mind, from a study of particulars, thus either forms a class notion as noun, triangle, hepatica, etc., or draws a general conclusion as, "Air has weight," "Any two sides of a triangle are together greater than the third side," it is said to gain general knowledge.

ACQUISITION OF GENERAL KNOWLEDGE

=A. Conception.=--In describing the method of attaining general knowledge, it is customary to divide such knowledge into two slightly different types, or classes, and also to distinguish between the processes by which each type is attained. When the mind, through having experienced particular dogs, cows, chairs, books, etc., is able to form such a general, or class, idea as, dog, cow, chair, or book, it is said to gain a class notion, or concept; and the method by which these ideas are gained is called _conception_.

=B. Induction.=--When the mind, on the basis of particular experiences, arrives at some general law, or truth, as, "Any two sides of a triangle are together greater than the third side"; "Air has weight"; "Man is mortal"; "Honesty is the best policy"; etc., it is said to form a universal judgment, and the process by which the judgment is formed is called a process of _induction_.

=Examples of General and Particular Knowledge.=--When a pupil learns the St. Lawrence River system as such, he gains a particular experience, or notion; when he learns of river basins, he obtains a general notion. In like manner, for the child to realize that here are eight blocks containing two groups of four blocks, is a particular experience; but that 4 + 4 = 8, is a general, or universal, truth. To notice this water rising in a tube as heat is being applied, is a particular experience; to know that liquids are expanded by heat is a general truth. _The air above this radiator is rising_ is a particular truth, but _heated air rises_ is a general truth. _The English people plunged into excesses in Charles II's reign after the removal of the stern Puritan rule_ is particular, but a _period of license follows a period of repression_ is general.

=Distinction is in Ideas, not Things.=--It is to be noted further that the same object may be treated at one time as a particular individual, at another time as a member of a class, and at still another time as a part of a larger individual. Thus the large peninsula on the east of North America may be thought of now, as the individual, Nova Scotia; at another time, as a member of the class, province; and at still another time, as a part of the larger particular individual, Canada.

=Only Two Types of Knowledge.=--It is evident from the foregoing that no matter what subject is being taught, so far as any person may aim _to develop a new experience_ in the mind of the pupil, that experience will be one or other of the two classes mentioned above. If the aim of our lesson is to have the pupils know the facts of the War of 1812-14, to study the rainfall of British Columbia, to master the spelling of a particular word, or to image the pictures contained in the story _Mary Elizabeth_, then it aims primarily to have pupils come into possession of a particular fact, or a number of particular facts. On the other hand, if the lesson aims to teach the pupils the nature of an infinitive, the rule for extracting square root, the law of gravity, the classes of nouns, etc., then the aim of the lesson is to convey some general idea or truth.

APPLIED KNOWLEDGE GENERAL

Before proceeding to a special consideration of such type lessons, it will be well to note that the mind always applies general knowledge in the learning process. That is, the application of old knowledge to the new presentation is possible only because this knowledge has taken on a general character, or has become a general way of thinking. The tendency for every new experience, whether particular or general, to pass into a general attitude, or to become a standard for interpreting other presentations, is always present, at least after the very early impressions of infancy. When, for instance, a child observes a strange object, dog, and perceives its four feet, this idea does not remain wholly confined to the particular object, but tends to take on a general character. This consists in the fact that the characteristic perceived is vaguely thought of as a quality distinct from the dog. This quality, _four-footedness_, therefore, is at least in some measure recognized as a quality that may occur in other objects. In other words, it takes on a general character, and will likely be applied in interpreting the next four-footed object which comes under the child's attention. So also when an adult first meets a strange fruit, guava, he observes perhaps that it is _pear-shaped, yellow-skinned, soft-pulped_, of _sweet taste_, and _aromatic flavour_. All such quality ideas as pear-shaped, yellow, soft, etc., as here applied, are general ideas of quality taken on from earlier experiences. Even in interpreting the qualities of particular objects, therefore, as this rose, this machine, or this animal, we apply to its interpretation general ideas, or general forms of thought, taken on from earlier experiences.

The same fact is even more evident when the mind attempts to build up the idea of a particular object by an act of imagination. One may conceive as present, a sphere, red in colour, with smooth surface, and two feet in diameter. Now this particular object is defined through the qualities spherical, red, smooth, etc. But these notions of quality are all general, although here applied to building up the image of a particular thing.

PROCESSES OF ACQUIRING KNOWLEDGE SIMILAR

If what has already been noted concerning the law of universal method is correct, and if all learning is a process of building up a new experience in accordance with the law of apperception, then all of the above modes of gaining either particular or general knowledge must ultimately conform to the laws of general method. Keeping in view the fact that applied knowledge is always general in character, it will not be difficult to demonstrate that these various processes do not differ in their essential characteristics; but that any process of acquiring either particular or general knowledge conforms to the method of selection and relation, or of analysis-synthesis, as already described in our study of the learning process. To demonstrate this, however, it will be necessary to examine and illustrate the different modes of learning in the light of the principles of general method already laid down in the text.