Volume Volume2\Philosophical Maxims & Morals
Entry# 1211. On spirits (1211--1213).
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On spirits (1211--1213).
O mathematicians shed light on this error.
The spirit has no voice, because where there is a voice there is a
body, and where there is a body space is occupied, and this prevents
the eye from seeing what is placed behind that space; hence the
surrounding air is filled by the body, that is by its image.