A NEW METHOD OF A COMMONPLACE BOOK
I take a paper book of what size I please. I divide the two first pages that face one another by parallel lines into five-and-twenty equal parts, every fifth line black, the other red. I then cut them perpendicularly by other lines that I draw from the top to the bottom of the page. I put about the middle of each five spaces one of the twenty letters I design to make use of, and, a little forward in each space, the five vowels, one below another, in their natural order. This is the index to the whole volume, how big soever it may be.
The index being made after this manner, I leave a margin in all the other pages of the book, of about the largeness of an inch, in a volume in folio, or a little larger; and, in a less volume, smaller in proportion.
If I would put anything in my Commonplace Book, I find out a head to which I may refer it. Each head ought to be some important and essential word to the matter in hand, and in that word regard is to be had to the first letter, and the vowel that follows it; for upon these two letters depends all the use of the index.
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.