116 MIND AND MEMORY TRAINING

many words as you can for each: 2, 3175, 174—1, 1953. 2, 651, 51—0, 6415, 1, 9, 214101, 9, 1, 45, 756, 8, 80620, 21, 1, 45. 756, 8, 04620.10, 01956321, 010, 2, 012141,14,17140, 67, 1, 09650, 2, 1, 74, 8, 65142.

The key to the above sentence is: "A new medical degree— the Diploma in Child Health—is shortly to be introduced by the Royal College of Physicians and the Royal College of Surgeons. Its establishment sets, a new standard for doctors wishing to specialize in the care of children."

In the last chapter I gave a telephone number, 8715, a motor-car number, 208457, and a passport number, 062246. If we wish to remember these by the number-word method we could form "full kettle," "unsafe rowlock," and "such inane rush" respectively. In this case we must remember that we are using the adjectives in full in reference to the two larger numbers.

Now let us suppose that the telephone, the motor car and the passport belong respectively to a Mr. Smith, a Mr. Brown and a Mr. Robinson; we can connect the numbers with those persons by: full kettle—repair to kettle—tin- smith—Smith; unsafe rowlock—-boat—drown—Brown ;such inane rush—danger—robbery—Robinson.

If they are your own telephone, motor car and passport you may remember them by: full kettle—bubbling sound— ringing sound—telephone; unsafe rowlock—boat—convey- ance—motor car; such inane rush—travel—passport. The student may perhaps improve upon these associations; I have given the first that came into my head.

A man with a good memory for numbers, and thoroughly familiar with their manipulation, might be able, with some effort, to remember a dozen or twenty digits once read out to him; but it would be indeed difficult to find a man who could remember, say, a thousand numbers in that way, though the task of doing so by our method of substitution is simplicity itself.

There are several ways of arranging the digits in a very long number. The method I recommend is that of taking them in groups of three and then finding number-words for them.

I will take at random—921840365719283605712823701 562394. For this I may form the following series of words: bind, freeze, marine shell, cool dip, new vim, chisel, cotton, venom, ghost, legion, empire. These words are almost the first that occur to me, and are by no means necessarily the best. I use them to show what can be done off-hand, though it is better generally to go over the numbers and choose the words more carefully when there is time.

The next step is to link the words by intermediaries, where necessary, as, bind (fix) freeze (water) marine shell (sea) cool dip (nudity) new vim (keen, tool) chisel (shavings, soft, cotton-wool) cotton (cotton-thread, stringy, snake) venom (fear) ghost (dead, dead warriors) legion (Roman legion) empire.

Another method of making number-words was "dis- covered" by M. Gouraud, and expounded in his Phreno-

Mnemotechny, published in New York and London in 1845.

He called it "number metamorphosis."

His metamorphoses were made through similarity of sound. The name of some object of sense was substituted for the name of the number, thus: for the figure zero, hero; for the number one, a wand; for the number two, a tooth; for three, a tree; for four, a fort; and so on.

These metamorphosed words or "homophones" were used as "pegs" on which to hang nine or ten numbers each, while the ten numbers were formed into a sentence on the principle

of number-words.

M. Gouraud showed how to apply this method to keeping in mind the ratio of the circumference to the diameter of a circle to the extent of 154 decimals, a feat which he per- formed by learning sixteen simple sentences.

118 MIND AND MEMORY TRAINING

The first nine numbers are 3 1 4 1 5 9 2 6 5 , for which he formed the ridiculous sentence: "My deary dolly, be no chilly." This, the first set, is the "hero" set, and was linked with that word by the supposition that a hero was uttering the sentence.

The sentences are difficult to make, and the Unking is decidedly primitive, but apart from these elements, the scheme of metamorphosed key-numbers proves very useful. It may, for example, be used as providing starting-points for a series of our number-words, which may very readily be linked on to it. We may choose thirty numbers, as before, 9218403657, 1928360571, 2823701562, and remember them in three sets of ten, each preceded by one of the key-words. The digits from the first to the tenth will be under the aegis of '"hero," the eleventh to the twentieth under "wand," and so on. Thus for the foregoing numbers we may make three sets: hero, bone, devour, smash, leg; wand, tap, knife, images, locket; tooth, hen, fan, hammock, stall, chain. These could be connected, where it is necessary, by (mighty dead), (hungry dog), (crunch), (broken leg); (blow), (cut), (gleaming and mirror), (portrait); (beak), (feather), (swing), (rest), (rope).

This method facilitates the location of the digits, and enables one to pick out a number required, without the trouble of counting along the whole series.

A third plan, which I prefer to M. Gouraud's, is to select number-words for key-words, instead of homophones; for example, instead of hero, use ice, sea, saw, ass, sow, sue, ease, essay, hose, house, or any other zero word; instead of wand use tea, tie, add, oat, toe, height, youth, or any other word standing for the number one. In this case it is easy to find a word suited to the series which it is required to begin.

It will now be seen that the task of remembering dates is a very easy one. All that needs to be done is to take the last three digits of the date, form a word from them, and connect

this in turn with the idea of the event by our link method.

There are, of course, other devices useful to students, such as that of making charts of centuries, divided into squares for each year or ten years, and fixing small symbols in each square to represent the happenings of the period.

I will content myself with one or two examples of the link method: Queen Boadicea raised an army against the Romans and killed 7000 of them, in the year A.D. 67—check. King Arthur, famous for his powerful resistance and victories over the Saxons, A.D. 514—leader. Queen Elizabeth ascended the English throne, 1558—fond of praise—lady-love. Ger- many annexed Austria, 1938, bold move. Transatlantic air mail began, 1939, air—air-pump—pump.

CHAPTER XVIII PLACING THE MEMORY

IN a previous chapter I have mentioned that the Greek poet Simonides had the idea of symbolizing complex or abstract ideas so as to remember them easily. The examples I took were from a hypothetical discourse in which government, financial matters and naval affairs and the necessity for wisdom in the policy of the time, would be represented respectively by a crown or sceptre, a current coin, the image of a ship, and the figure of Minerva.

We are also indebted to him for the idea of using places or positions in which to put ideas for safe-keeping in the mind, much as we put papers in pigeon-holes or files.

Suppose that we provide our places in a house which is quite familiar to us. Then, if we enter our house at the front door and number all the objects we see in turn—the doormat I, the brass step 2, a picture 3, a hatrack 4, an umbrella stand 5, and so on—we have at once a basis for remembering a large number of things in order.

In the discourse above mentioned we might place the crown on the doormat, the coin on the brass step, the ship in the picture, a statue of Minerva on the hatrack, and so on. Thus the speaker could avoid missing any of them in the course of his speech or debate.

The incident which led Simonides to this mnemonic device of places is related as follows by Cicero. I have taken it from Dr. Pick's History of Mnemonics (1866).

"A man named Skopas, at Kranon, in Thessalia, once gave a grand dinner in honour of a victorious gladiator. Among the guests was the poet Simonides, who, during the repast, recited some verses he had composed in honour of the hero of the feast. After his recitation, he was called outside, and

had scarcely left the room, when the ceiling fell in, crushing Skopas and all his guests. When the relatives of the killed came to bury the remains, they found them so smashed and disfigured, that they could not distinguish one body from another. It happened, however, that Simonides had ob- served the place which each person had occupied; and on looking at the several places, he was able to identify all the bodies. This led him to believe that nothing could better assist the memory than to retain in the mind certain fixed places, and therein to deposit, with the assistance of the imagination, whatever we intend to keep in our memory." The following extract from Quintilian shows how the idea was used among the ancients—

"You choose a very spacious and diversely arranged place —a large house, for instance, divided into several apart- ments. You impress on the mind with care whatever is remarkable in it; so that the mind may run through all the parts without hesitation or delay; for the essential is not to hesitate before the objects, as remembrances destined to help other remembrances should be more than sure. More- over, for recalling to mind what you have written or simply meditated, you help yourself with any sign borrowed from the matter you have to treat of—if the object should be one of war, navigation, or the like; or with some word, for a word suffices to refresh the memory, as soon as it begins to fail. If the object is navigation, the sign will be an anchor; if it is war, it will be a weapon.

"Then you proceed as follows: you place the first idea in the hall, the second in the parlour, and so on with the rest, going over the windows, the chambers, to the statues and similar objects. This done, if the object is to apply that pro- ceeding to the memory, you look over every apartment, beginning with the first, and recalling at every picture the idea which was confided to it; so that, howsoever numerous the things may be which are to be kept in mind, they are