This section explores the "internal dimensions" of natural entities, categorized by their complexity:
: Discusses the human soul, volition, and the perfection of human action as a culmination of natural philosophy. Part II: Philosophy of Science The Modeling of Nature: Philosophy of Science a...
: Investigates metabolism, sentience, and the inherent "powers" that distinguish living organisms. This section explores the "internal dimensions" of natural
Wallace shifts to the methodology of discovery, defining science as a form of "probable reasoning" that can eventually arrive at certitude: The Modeling of Nature: Philosophy of Science a...