He remarks that it is impossible to suppose that the particles of mastic are in the form of bubbles.
The light scattered from small particles is of a much richer blue than the blue of the first order as reflected from a very thin plate.
The only motion in the air was that of the dripping, microscopic particles of drizzling mist.
Consider the particles which occupy a thin stratum dx perpendicular to the primary ray x.
The same is true in the case of a liquid such as water; it can be divided into drops and these again into smaller drops, or into the finest spray the particles of which are too small to be detected by our unaided vision.