Or the Doctrine of Equilibrium: Being an Attempt to Prove that Not Only the Health of Vegetables and Animals, But All Systems and Principles in Nature, Depend Upon an Equilibrium of Action Between Two Extremes, and that the Impulse Or Force by which They are Produced, as Well as Destroyed, is Owing to the Magnetic Fluids which Operate Both at the Same Time, on the Same Object Or Principle ...