It is often convenient for a teacher, and others, to recall the number of a page of a book in which a citation is found. In Prof. William James's Psychology Abridged for Schools and Colleges, the chapter on Habit begins on p. 134, or "(1) {Th}e (3) {M}ould (4) {R}ules;" the chapter on Will begins on p. 415: "A (4) {R}esolve (1) {D}enotes (5) Wi{l}l;" the chapter on Attention begins on p. 217, or "(2) {N}otice (1) A{t}tention's (7) {Q}ualities;" the chapter on Association begins on p. 253, or (2) "{N}ow (5) He{l}p (3) {M}emory;" and that on Memory on p. 287, or "(2) I{n}tellect (8) {F}orbids (7) {C}ramming." Prof. Loisette's New York Office is in Fifth Avenue at No. 237, or "A (2) {N}ew (3) {M}emory (7) {G}iven," or "A (2) {N}ew (3) {M}emory (7) A{c}quired." His London Office was formerly at 37 [a {m}emory {g}ained] New Oxford Street. It is now at _200 Regent Street, London_ [(2) {N}ow (0) {S}ecure (0) A{s}similation]. 3. SOMETIMES THE FIRST TWO CONSONANTS OF A WORD ARE USED. Sheridan's famous ride occurred in 1864. In dates of the last and present century it is usual to indicate the last two figures of the date. 64, therefore, is all we need express. Formula: Sheridan's ride in 1864--(64) {Ch}ee{r}s; or, (64) {Sh}e{r}idan. The Pennsylvania Whisky Rebellion took place in 1794; or, (94) {B}{r}ewery. 4. SOMETIMES THE FIRST AND LAST CONSONANTS OF A WORD ARE USED, AND SOMETIMES TWO CONSONANTS IN THE MIDDLE OF A WORD. These devices are rarely resorted to, but if ever used, they must be thoroughly assimilated. Battle of Waterloo was fought in 1815; 15 may be found in the _t_ and _l_ of (15) Wa{t}er{l}oo. Herbert Spencer was born, as we have already seen, in 1820. The 20 may be found in the _n_ and _c_ of Spe{n}{c}er. 5. Never, on any account, use the same word to express two different dates; as, its first two consonants for one date and its two middle, or its first and last consonants, to express another date. 6. _Never fail to carefully analyse the relations between the fact or event and its date or number word._ SUBJECT TO THE EXCEPTIONS HEREAFTER NAMED, ALL DATES AND NUMBERS SHOULD BE EXACTLY EXPRESSED IN THE DATE OR NUMBER WORDS.