XIII. 'RADIANT MATTER'
Electricity and magnetism as manifestations of interacting levity and gravity. Electricity - a product of disintegrating matter. Modern physics, no longer a 'natural' science. Eddington's question,' Manufacture or Discovery?' Man's enhanced responsibility in the age of physical science.
XIV. COLOURS AS 'DEEDS AND SUFFERINGS OF LIGHT'
Goethe's Farbenlehre - the foundation of an optical science based on the colour-seeing faculty of the eye. The modern physicist's view of the Newtonian interpretation of the spectrum. A short history of Goethe's search for a satisfactory conception of Light and Colour. His discovery of Newton's cardinal error. First results of his own studies. The 'negative' spectrum.
XV. SEEING AS 'DEED' - I
Goethe's way of studying the totality of the act of seeing. The 'inner light'.
XVI. SEEING AS 'DEED' - II
Extension of Goethe's inquiry to a pursuit of the act of seeing beyond the boundaries of the body.
XVII. OPTICS OF THE DOER
Purging optics from its onlooker-concepts. The role of foregone conclusions in the physical conception of light. The true aspect of the so-called velocity of light.