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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 surface of the sponge I have found a peculiar protozoon which resembles the European Trichodina spongill� in general structure but belongs, I think, to a distinct species, if not to a distinct genus.

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.