The same thing may be ascertained by our own experience, in hearing a lecture or sermon, or even in conversation with a friend. In these cases, as long as our attention is kept up,--that is, as long as we continue to reiterate the ideas that we hear,--we may remember them; but when our minds flag, or wander; in other words, when we cease to reiterate the ideas of the speaker, the sounds enter our ear, but the matter is gone. All that has been said during that period of inattention has been lost; it never has formed, and never can form, part of our knowledge. Thus we see, that in the act of hearing oral communications, the principle of reiteration of the ideas is obviously necessary for the acquiring of knowledge; and we shall now shew, that it is equally necessary in the act of reading. Many persons must have witnessed children reading distinctly, and fluently perhaps, who yet were not made one whit wiser by what they read. The act of reading was correctly performed, and yet there was no accession to their knowledge. The cause of this is easily explained. The _ideas_ conveyed by the words have not been reiterated by the mind,--perhaps they were never perceived. For as long as the act of reading is difficult, the words undergo this process first, and the ideas must be gleaned afterwards. Hence it is, that children, when hurried from lesson to lesson before they can read them so easily as to perceive and reiterate the ideas while reading, acquire the habit of decyphering the words alone, and the eye from practice reads mechanically, while the mind at the moment is usually wandering, or is engaged in attending to something else. Nature, as we have before shewed in the act of hearing, does not intend that the mind should pay attention both to the words and the ideas at the same time; and reading being only an artificial substitute for hearing, is made subject to the same law. It is the _ideas_ that Nature induces us to grapple with; and the reading of words like the hearing of language, is merely the means employed to get at them. Hence the necessity of children being taught to read fluently, and with perfect ease, before they leave the school; and the neglect of this is the reason why so many after leaving school, derive so little instruction from the use of books. Of these individuals, experience shews, that many, who on leaving school could not collect ideas by their mode of mechanical reading, yet persevere, and at last teach themselves by long practice to understand what they read; while there are not a few who, in similar circumstances, become discouraged, abandon the practice of reading, and soon forget the art altogether.