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Our knowledge of the external world
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acetic acid appear Appendix associated atoms autocatalyst beauty behaviour body and fields brain causation cell Chapter cognitive component consciousness constant cosmon Descartes direct realist duplex processes electrical charge electricity electron ethyl acetate event of knowing existence external events objects external object factor of emotion factor of intellect factor of volition free photon freedom fundamental particle gravitational human hypothesis individual inertial mass integration intellectual truth interpretation isolated event judgement kind living organisms magnetism mass-space-time matter mental mesonism mind molecules morphogenesis nature nebula nucleons observed orbital orderly change organisation perceived perceptual event perceptual sensa percipient person phase photon physical polarised polarity position positron present prime psychic factors prime scientific factors problem proper wave-system qualities ratio realist reason regarded represented rest mass scientists sense-field sensum theory society space space-time spatial species spin supposed three prime psychic tion universe velocity visual sensum wave wave-change wave-path wave-period whilst whole