MEDIUM 221 



also regular, since they represent a relation of 

 cause and effect ; the sand arrangement is the 

 organic expression of acoustic energy. 



This pretty experiment enables us to foresee that 

 in the world everything that has a regular form 

 obeys an energy, regular also. 



Where are these energies and rhythms ? 



Cosmic Medium 



It is now known that all energies are modes of 

 movement, different degrees of vibration. 



Vibrations have their scale, and, beginning with 

 the least number of vibrations, we find the musical 

 sound, which is perceptible when the vibrations 

 reach 128, which is the ut or initial do (see p. 125). 



Light is another mode of vibration, much more 

 intense than the vibrations that constitute sound. 

 Colours are vibrations of reflected light, whose 

 number of vibrations permits of their being per- 

 ceived by the sense of sight. 



We have already seen in another part of this 

 book (p. 23 ff.) how the crystalline lens in inferior 

 animals took its lenticular aspect from the fact 

 that light, on crossing the coloured spots, accom- 

 modates its index of refraction and its ray to the 

 law of optics, without which vision would not be 

 possible. 



