"Mountains and oceans have whole worlds of innumerable wondrous features. We should understand that it is not only our distant surroundings that are like this, but even what is right here, even a single drop of water."

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No one would have believed in the last years of the nineteenth century that this world was being watched keenly and closely by intelligences greater than man's and yet as mortal as his own; that as men busied themselves about their various concerns they were scrutinised and studied, perhaps almost as narrowly as a man with a microscope might scrutinise the transient creatures that swarm and multiply in a drop of water.

— H. G. Wells