Basic Knowledge -- The General Modifier Mechanism -- Taxonomy of Enzyme-Modifier Interactions and the Specific Velocity Plot -- Complements to Enzyme-Modifier Interactions -- The Basic Mechanisms of Inhibition and Nonessential Activation -- Multiple Enzyme-Modifier Interactions -- Multiple Interactions: Essential Activation and Liberation -- Slow-Onset Enzyme Inhibition -- Enzyme Inactivation with a Note on the Significance of Slow Modification Processes.- Dichotomous Keys to Enzyme-Modification Mechanisms. .