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.
Consider the particles which occupy a thin stratum dx perpendicular to the primary ray x.
The only motion in the air was that of the dripping, microscopic particles of drizzling mist.
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.