Full Idea
From Chrysippus onwards, the Stoics identified the logos throughout each world-cycle not with pure fire, but with a compound of fire and air, 'pneuma'.
Gist of Idea
The later Stoics identified the logos with an air-fire compound, called 'pneuma'
Source
report of Chrysippus (fragments/reports [c.240 BCE]) by A.A. Long - Hellenistic Philosophy 4.4.2
Book Reference
Long,A.A.: 'Hellenistic Philosophy' [Duckworth 1986], p.155
A Reaction
I suspect this was because breath is so vital to the human body.
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