THE SCIENCE OF NUMBERS
Material letter, while the Capstone, as the finishing, or completing force, holds the fulfillment of all the possibilities of the name.
The Cornerstone, Keystone, and Capstone apply to the first, second, and third degrees of each number, and respectively to the numbers in each Triad, as shown by the following tables, the first of which indicates their application to the Triads:
FIFTH TABLE
| Cornerstone | Keystone | Capstone |
| 1 | 5 | 7 |
| 2 | 4 | 8 |
| 3 | 6 | 9 |
Thus, 1 is the Cornerstone; 5, the Keystone; and 7, the Capstone, of the Triad of 1–5–7.
In regard to the letters and their respective numbers, the application is as follows:
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