The necessary condition for a successful system of telephony is the ability to reproduce these characteristics.
It is also a necessary condition for the application of the preceding laws that no form of energy except heat and the intrinsic energy of the substances should be ultimately involved.
On the other hand the democratic tone which distinguishes Micah from Isaiah, and his announcement of the impending fall of the capital (the deliverance of which from the Assyrian appears to Isaiah as the necessary condition for the preservation of the seed of a new and better kingdom), are explained by the fact that, while Isaiah lived in the centre of affairs, Micah, a provincial prophet, sees the capital and the aristocracy entirely from the side of a man of the oppressed people, and foretells the utter ruin of both.
Now, this oppositing of the Anstoss is the necessary condition of the practical ego, of the will.
To Descartes, who made extension the sole essential property of matter, and matter a necessary condition of extension, the bare existence of bodies apparently at a distance was a proof of the existence of a continuous medium between them.
