A comparison of A5 with the normal form of the kin sign in figure 34, a, shows that these two forms are identical.

Indeed, A5 is composed of this sign alone with its usual coefficient of 9.

For the planets, in virtue of Kepler's law, the effect varies then inversely as √a5; it is therefore insensible, save for Mercury.

This is generated by the decay of animal and vegetable substances, and is to a5 considerable degree soluble in water.