I omit three letters of the alphabet as of no use to me, viz. K, Y, W, which are supplied by C, I, U, that are equivalent to them. I put the letter Q that is always followed with an u in the fifth space of Z. By throwing Q last in my index, I preserve the regularity of my index, and diminish not in the least its extent; for it seldom happens that there is any head begins with Zu. I have found none in the five-and-twenty years I have used this method.... When I meet with anything that I think fit to put into my commonplace book, I first find a proper head. Suppose, for example, that the head be EPISTOLA, I look into the index for the first letter and the following vowel, which in this instance are E i; if in the space marked E i there is any number that directs me to the page designed for words that begin with an E, and whose first vowel after the initial letter is I, I must then write under the word Epistola, in that page, what I have to remark. I write the head in large letters and begin a little way out into the margin, and I continue on the line, in writing what I have to say. I observe constantly this rule that only the head appears in the margin, and that it be continued on, without ever doubling the line in the margin, by which means the heads will be obvious at first sight.... If the head is a monosyllable and begins with a vowel, that vowel is at the same time both the first letter of the word and the characteristic vowel. Therefore I write the word Ars in A a and Os in O o.... As to the language in which one ought to express the heads I esteem the Latin tongue most commodious, provided the nominative case be always kept to.... But it is not of much consequence what language is made use of, provided there be no mixture in the heads of different languages.--W. LOCKE (Letter to Mr. Toignard). A commonplace book contains many notions in garrison, whence the owner may draw out an army into the field on competent warning.--T. FULLER. _The Holy and the Profane State._ Reading without thinking may indeed make a rich commonplace, but 'twill never make a clear head.--J. NORRIS. _On the Advantages of Thinking._ MARGINAL NOTES AND COMMONPLACE BOOKS It is the practice of many readers to note, in the margin of their books, the most important passages, the strongest arguments, or the brightest sentiments. Thus they load their minds with superfluous attention, repress the vehemence of curiosity by useless deliberation, and by frequent interruption break the current of narration or the chain of reason, and at last close the volume, and forget the passages and marks together.