Thought in blood

Use in the book

Theophrastus explains blood's cognitive importance through the especially complete blending of the elements in it. Equal or nearly equal mixture, appropriate spacing, and moderate size make a person intelligent and perceptually exact. Loose, rare arrangements make sluggish labouring minds; dense small constituents produce rapid movement, many undertakings, and few completions through the speed of the blood's motion. A locally balanced blend accounts for specialized skill in tongue or hands.

The refutation raises different objections rather than a single anti-materialist rejection. Many animals are bloodless; sensory regions in blooded animals are relatively blood-poor; bone and hair also have the elemental composition used to explain cognition. At §24 the critic further denies that a blend alone explains the skill exercised through an organ. Aëtius's separate location of the governing part in the composition of blood is closely related, while Theodoret preserves alternatives involving heart cavity or blood.

Plato's Phaedo supplies a contextual question about whether blood is what we think with, but does not name Empedocles in the passage. Its value is reception and intellectual setting, not an independently explicit attribution. The physiological reports warrant a substantial account of thinking with blood; they do not prove the complete identity of thought with one fluid state or authorize a modern neuroscientific translation.

Places to read

1. A 86 §§ 10–11 (testimony)Theophrastus, On the Senses 10. Explains the privileged cognitive role of blood by elemental blending.
2. A 86 §§ 10–11 (testimony)Theophrastus, On the Senses 11. Links blood constitution and movement to intellectual differences.
3. A 86 §§ 22–23 (polemical)Theophrastus, On the Senses 23. Challenges blood-centred cognition through bloodless animals and sensory anatomy.
4. A 97 (testimony)Aëtius; Theodoret, Cure of the Greek Maladies. Locates the governing part in blood composition or the cardiac region.
5. A 76 (reception)Plato, Phaedo. Asks whether blood is the medium of thinking without naming Empedocles.

Translation in this edition

The note links this dossier to B105's blood about the heart. A862345678910111213 itself says blood, not “the blood about the heart” in its central causal sentence; retain that difference rather than silently importing the fuller fragment.