The physics and philosophy of the senses; or, The mental and the physical in their mutual relation

action afferent nerves animal atoms believe Berkeley brain called cause centre cerebellum cerebral cerebral hemispheres cerebrum chapter colour conceive conception connection conscious corpora quadrigemina crystalline lens Descartes difficulty direction discover distinct effect endeavour energy evident excited exercise existence experience explained external objects fact faculty force ganglia ganglionic human ideas impressions impulse insensible intelligence intuition Kant knowledge laws lens light limbs lobes Malebranche matter means medulla oblongata mental metaphysical mind molecules movements muscles muscular nature nerve fibres nervous observed operation optic nerve organs of sense papillæ peculiar perceive perception phenomena philosophy physical power Plato position possess principle produced properties pure question rays reason reflex action refraction regard Reid result retina sensations sensibility sensorium sensory smell sound spherical aberration spinal cord spiritual stereoscope substance supposed surface taste theory things thought tion touch vibrations vision visual voluntary motion writers