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From all this I come to the following Corollary.
The rapidity and strength with which two given notions stick together, is in the ratio of their joint familiarity.
This is what I declare the first of the two principles of the art of memory discovered by myself, and christened with the name of
THE PRINCIPLE OF FAMILIARITY.
The nature, the truth, and the importance of it is already acknowledged by thousands—these thousands, in company with the press, will soon plant it in the brains of all.
At the head of my introductory Lecture, published a year ago, I inscribed these presumptuous words—
