Brandis assigned 258 years to the 3rd dynasty; other **summations** have been proposed with equally little assurance of certainty.

The **summations** of years for the Dynasties XII.

If we have a continuous distribution of matter, instead of a system of discrete particles, the **summations** in (6) are to be replaced by integrations.

In the case of continuous distributions of matter the **summations** in (9), (10), (II) are of course to be replaced by integrations.

Where (X, Y, Z) and (L, M, N) are the forceand coupleconstituents of the system of extraneous forces, referred to 0 as base, and the **summations** extend over all the mass-elements of the system.