Aristotle’s Physics Reviewed. 
175 
lished, he rationally deduces from first principles of reason, by aid of his 
accurately defined concepts. 
1. All change is reducible to local motion. 
2. Energy is an unchangeable quantum, enduring through all transmu¬ 
tations. Motion is never destroyed. 
3. All indefinitely continuous motion (local) is in curved lines. 
4. Light, and, by parity of reasoning, all changes of condition in mat¬ 
ter, transmitted through space, are not instantaneous, but require time for 
their transmission. 
