Usually, but not invariably, the slower oscillation involves also a larger molecule--a molecule, that is, built up by a special arrangement of the smaller molecules of the next higher subdivision.

The application of heat increases the size of the molecules and also quickens and amplifies their undulation, so that they cover more ground, and the object, as a whole expands, until the point is reached where the aggregation of molecules breaks up, and the latter passes from one condition to that next above it.

In the matter of the physical world the seven subdivisions are represented by seven degrees of density of matter, to which, beginning from below upwards, we give the names solid, liquid, gaseous, etheric, superetheric, subatomic and atomic.
The atomic subdivision is one in which all forms are built by the compression into certain shapes of the physical atoms, without any previous collection of these atoms into blocks or molecules.

Typifying the physical ultimate atom for the moment by a brick, any form in the atomic subdivision would be made by gathering together some of the bricks, and building them into a certain shape.

In order to make matter for the next lower subdivision, a certain number of the bricks (atoms) would first be gathered together and cemented into small blocks of say four bricks each, five bricks each, six bricks or seven bricks; and then these blocks so made would be used as building stones.