Only the frictionless medium was lacking to fulfil all the conditions of Helmholtz's indestructible vortices.

We will therefore consider the problem of the existence of a frictionless medium from the philosophical standpoint.

Helmholtz found that a vortex whirl, once established in a frictionless medium, must go on, theoretically, unchanged forever.

And at once Lord Kelvin bethought him of the frictionless medium which physicists had now begun to accept-theall-pervadingether.

If the Aether really possesses inertia, then it must possess mass, and possessing mass it ceases to be a frictionless medium.

I have already shown that a frictionless medium is opposed to all philosophy and experience, and is an anomaly in the universe.

But with a frictionless medium, it is an absolute impossibility to conceive of different degrees of density of the Aether in association with matter.