This work surveys the science of intellection, tracing how sensations become judgments, and how concepts emerge from concrete experience. It blends psychology, philosophy, and early scientific method to explain how we classify, measure, and reason about the world.

Grounded in a detailed theory of sensation and apperception, the book shows how five core properties of things—kind, form, force, causation, and conception—arise from interacting senses and remembered judgments. It argues for a practical, scientific approach to understanding mind, matter, and the processes that connect them, while challenging purely metaphysical explanations.

Defines sensation as the cognition of properties as kinds and explains how verification works through repetition and cross-sense checks.
Introduces apperception as the unifying process by which disparate senses confirm a single object’s properties.
distinguishes presentative (inductive) and representative (deductive) judgments and shows how they drive learning and generalization.
Links the philosophy of science to concrete methods in observation, measurement, and psycho-physics.

Ideal for readers curious about the foundations of knowledge, perception, and the scientific study of thought.

About the Author

John Wesley Powell (1834 1902) was a US soldier, geologist, explorer of the American West, and director of major scientific and cultural institutions. He is famous for the 1869 Powell Geographic Expedition, a three-month river trip down the Green and Colorado rivers that included the first known passage through the Grand Canyon.

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