Untitledself-destructively would be eliminated in the struggle for existence.When a simple one-celled organism explores a corner of the field seenunder a microscope, behaving to all appearance very like a dog scouringa field seen through a telescope, it seems permissible to think ofsomething corresponding to mental endeavour associated with itsactivity. This impression is strengthened when an amoeba pursuesanother amoeba, overtakes it, engulfs it, loses it, pursues it again,recaptures it, and so on. What is quite certain is that the behaviour ofthe animalcule is not like that of a potassium pill fizzing about in abasin of water, nor like the lurching movements of a gun that has gotloose and "taken charge" on board ship. Another feature is that thelocomotor activity of an animalcule often shows a distinctindividuality: it may swim, for instance, in a loose spiral.But there is another side to vital activity besides acting upon the
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Trial and error, close contact, simple one-celled organism, Slipper Animalcule