Abstract
Suggested Explanation of Photophoresis, that is the attraction or repulsion of microscopic particles by light as observed by Ehrenhaft and others. It has previously been shown that there are electric and magnetic forces acting on an illuminated transparent body in the direction of propagation of the light if the ether has an electric density ($\mathrm{Pe}$) and a magnetic density ($\mathrm{Pm}$) other than zero. When one dielectric is immersed in another, the difference between these radiation forces per unit volume acting on the two media, would give rise to a relative motion which may be either in the direction of the light or in the opposite direction.A Quantum Relation in Maxwell's Electromagnetic Theory is obtained if we equate the radiation pressure per unit area in terms of $\mathrm{Pe}$ and $\mathrm{Pm}$ to the pressure derived from the stresses assumed by Maxwell to exist in electric and magnetic tubes of force, namely, the ratio of the amplitude to the wave-length of light is a constant.
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