the family circle, still another for the playground, etc. This fact explains better than intentional reserve the observation that a boy is one being at home or at school and quite another among strangers.

30. Each body of ideas is made up of complications of ideas, which, if the union is perfect, come and go in consciousness as undivided wholes, and of series, together with their interlacings, whose members unfold successively, one by one, provided they are not checked. The closer the union of parts within these complications and series, the more absolute the laws according to which ideas act in consciousness, the stronger is the resistance against everything opposing their movement; hence the difficulty of acting upon them through instruction. They admit, however, of additions and recombinations, and so may in the course of time undergo essential changes; up to a certain point they even change of themselves if repeatedly called into consciousness by dissimilar occasions, e.g., by the frequent delivery of the same lecture before different audiences.

The general notions of things are complexes or complications of their attributes. Other examples of complexes important to instruction are furnished by logical concepts and words. But since words of several languages may be perfectly complicated or bound together with the same concept, without being just as intimately connected with one another, it should be noted that when the object or concept comes up at different times, it will be joined now with this and next with another language. Yet the repeated perception of the object is not quite the same perception as before, although earlier ideas mostly coalesce so fully with later homogeneous ideas that the difference makes itself felt but little.

31. The inner structure of groups of ideas becomes discernible in a measure when thoughts are bodied forth in speech. Its most general aspect is disclosed in the construction of a period. Conjunctions particularly are important in that they, without denoting a content of their own, serve as hints to the listener. They point out to him the connection, the antitheses, the positiveness, or the uncertainty of the speaker’s utterances; for the meanings of conjunctions can be traced back to the series-form, to negation and certitude. It should be noted that want and refusal are related to negation; expectation, together with hope and fear, to uncertainty, so that the consideration of thought masses must also include emotional states. Children possess the structure of thought just as they experience the emotional states, long before they know how to embody the same in words with the help of conjunctions. Certain conjunctions, such as, to be sure, although, on the contrary, either—or, neither—nor, etc., are not adopted by children until late.

32. Of equal importance with the inner organization of the pupil’s ideas are, for the teacher, the degree of ease or difficulty with which a given mass of ideas is called into consciousness, and its relatively long or brief persistence in consciousness. Here we are face to face with the conditions of efficient instruction and training. The most necessary statements relative to this subject will be made under the head of interest and character-building.

33. The capacity for education, therefore, is determined not by the relationship in which various originally distinct mental faculties stand to one another, but by the relations of ideas already acquired to one another, and to the physical organism. Every pupil must be studied with reference to both.