Eddington, Sir Arthur

A positron is a hole from which an electron has been removed; it is a bung-hole which would be evened up with its surroundings if an electron were inserted...

You will see that the physicist allows himself even greater liberty than the sculptor. The sculptor removes material to obtain the form he desires. The physicist goes further and adds material if necessary—an operation which he describes as removing negative material. He fills up a bung-hole, saying he is removing a positron.

The Philosophy of Physical Science Chapter VIII Section II (pp. 120-1)

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