Considering other like instances of the habitual exercise of intelligence and volition, which, from long familiarity with the method of procedure, escape the notice of the person exercising them, we naturally think of writing. The formation of each letter requires attention and volition, yet in a few minutes a practised writer will form several hundred letters, and be able to think and talk of something else all the time he is doing so. It will not probably remember the formation of a single character in any page that he has written; nor will he be able to give more than the substance of his writing if asked to do so. He knows how to form each letter so well, and he knows so well each word that he is about to write, that he has ceased to be conscious of his knowledge or to notice his acts of volition, each one of which is, nevertheless, followed by a corresponding muscular action. Yet the uniformity of our handwriting, and the manner in which we almost invariably adhere to one method of forming the same character, would seem to suggest that during the momentary formation of each letter our memories must revert (with an intensity too rapid for our perception) to many if not to all the occasions on which we have ever written the same letter previously—the memory of these occasions dwelling in our minds as what has been called a residuum—an unconsciously struck balance or average of them all—a fused mass of individual reminiscences of which no trace can be found in our consciousness, and of which the only effect would seem to lie in the gradual changes of handwriting which are perceptible in most people till they have reached middle-age, and sometimes even later. So far are we from consciously remembering any one of the occasions on which we have written such and such a letter, that we are not even conscious of exercising our memory at all, any more than we are in health conscious of the action of our heart. But, if we are writing in some unfamiliar way, as when printing our letters instead of writing them in our usual running hand, our memory is so far awakened that we become conscious of every character we form; sometimes it is even perceptible as memory to ourselves, as when we try to remember how to print some letter, for example a g, and cannot call to mind on which side of the upper half of the letter we ought to put the link which connects it with the lower, and are successful in remembering; but if we become very conscious of remembering, it shows that we are on the brink of only trying to remember,—that is to say, of not remembering at all.