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.

XVIII. THE SPECTRUM AS A SCRIPT OF THE SPIRIT

Evaluation of the foregoing studies for a new understanding of the
prismatic phenomenon. The secret of the rainbow. Intimation of new
possibilities of experimental research guided by the new conception of
the spectrum.


Part III TOWARDS A NEW COSMOLOGY

XIX. THE COUNTRY IN WHICH MAN IS NOT A STRANGER

(a) INTRODUCTORY NOTE

From Goethe's seeing with the eye-of-the-spirit to Spiritual
Imagination. Levity (Ether) as revealed to Spiritual Imagination.

(b) - (e) WARMTH LIGHT SOUND LIFE

The four modifications of ether. Their relation to the four elements.

XX. PRO ANIMA

(a) THE WELL-SPRINGS OF NATURE'S DEEDS AND SUFFERINGS