EQUATION AND THE NATUEE OF COHESION. 77 



to one that possibly the molecules of magnetic substances are trans- 

 parent to this cohesional attraction and propagated to a distance 

 the cohesion becomes recognizable to us as magnetism. Gravitation 

 thus becomes simply the cohesional attraction from which the effect 

 of the valence electrons has been absorbed. It is like light seen 

 through a colored glass; not all the light can pass. The molecules 

 might be likened to suns shining with an invisible and intense light 

 which we call cohesion. But while luminous itself each molecule 

 cuts off the light from the molecule behind it letting through only 

 a portion. That which comes through would correspond perhaps to 

 polarized light, or light from which one element had been absorbed, 

 and is what we call gravitation. 



