What properties are essential to a medium capable of transmitting wave motion? Roughly, we may say two: elasticity and inertia. - Oliver Lodge

I am as convinced of continued existence, on the other side of death, as I am of existence here. It may said, you cannot be sure as you are of sensory experience. I say I can. A physicist is never limited to direct sensory impressions, he has to deal with a multitude of conceptions and things for which he has no physical organ ....

It is not the germ cell itself, but the bodily accretion or appendage, which is abandoned by life, and which accordingly, dies and decays.

Life must be considered sui generis; it is not a form of energy, nor can it be expressed in terms of something else.