For this reason all mass cannot fall in the same direction or place. Space made vacant by falling mass must be filled with substances of greater density, and this process is Suction. When substances of greater density fall toward space of lesser density the process is Pressure. Suction and Pressure is the only force in Space. Each is dependent upon the other and nothing can move without their combined pull and push.
Suction is the female of movement and Pressure is the male of movement.
When substances of greater density fall, or are drawn toward Space of lesser density, a moving current is formed which moves everything of a movable nature in line with it. Currents are of different density and proportions. There are no limits to the largeness or smallness of currents and because of the difference in density they penetrate one another. Currents of greater density are penetrated by currents of lesser density. Currents of lesser density are penetrated by currents of greater density.