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When balance is disturbed—by anything from indigestion in a protozoon up to a storm on the ocean where he lives, there is a catastrophe.

On the first occasion the tentacles were completely covered with this protozoon, so that they appeared at first sight as though encased in flagellated epithelium.

You open another book idly, and you see: Organic life, we are told, has developed gradually from the protozoon to the philosopher, and this development, we are assured, is indubitably an advance.

This protozoon secretes a shell about itself which has a characteristic shape, and often carries spines.

Instead of comparing with a mammal at the top of the organic scale, it is like a formless, undifferentiated protozoon at the bottom.