3 For the drastic and as such very enlightening way in which Eddington
presents the problem, the reader is referred to Eddington's own
description.

4 Konfession des Verfassers.

5 Colour as quality being no essential factor in the scientific
explanation of the spectrum.

6 Contributions to Optics.

7 Outline of a Theory of Colour.

8 See Rudolf Steiner's edition of Goethe's Farbenlehre under
Paralipomena zur Chromatik, No. 27.

9 Goethe's own representation of the phenomenon. (The diagram is
simplified by omitting one colour on each side.)

10 This is not to be confused with the meaning of 'purple' in modern
English usage.

11 This follows from the application of Fourier's Theorem, according to
which every vibration of any kind is divisible into a sum of periodic
partial vibrations, and therefore is regarded as compounded of these.


CHAPTER XV