The discovery which has been pointed to by theory is always one of profound interest and importance, but it is usually the close and crown of a long and fruitful period, whereas the discovery which comes as a puzzle and surprise usually marks a fresh epoch and opens a new chapter in science.

The discovery which has been pointed to by theory is always one of profound interest and importance, but it is usually the close and crown of a long and fruitful period, whereas the discovery which comes as a puzzle and surprise usually marks a fresh epoch and opens a new chapter in science.

A fish probably has no means of apprehending the existence of water; it is too deeply immersed in it.

If the 'Principle of Relativity' in an extreme sense establishes itself, it seems as if even Time would become discontinuous and be supplied in atoms, as money is doled out in pence or centimes instead of continuously;-in which case our customary existence will turn out to be no more really continuous than the events on a kinematograph screen;-while that great agent of continuity, the Ether of Space, will be relegated to the museum of historical curiosities.

There is no instrument for measuring the pressure of the Ether, which is probably millions of times greater: it is altogether too uniform for direct apprehension. A deep-sea fish has probably no means of apprehending the existence of water, it is too uniformly immersed in it: and that is our condition in regard to the Ether.

But although life is not energy, any more than it is matter, yet it directs energy and thereby controls arrangements of matter.

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