When it reaches this stage we call it the second elemental kingdom, the ensouling life of which resides upon the higher mental levels, while the vehicles through which it manifests are on the lower.
After another vast period of similar length, it is found that the downward pressure has caused this process to repeat itself; once more the life has identified itself with its forms, and has taken up its residence upon the lower mental levels, so that it is capable of ensouling bodies in the astral world.

At this stage we call it the third elemental kingdom.
We speak of all these forms as finer or grosser relatively to one another, but all of them are almost infinitely finer than any with which we are acquainted in the physical world.

Each of these three is a kingdom of Nature, as varied in the manifestations of its different forms of life as is the animal or vegetable kingdom which we know.

After a long period spent in ensouling the forms of the third of these elemental kingdoms it identifies itself with them in turn, and so is able to ensoul the etheric part of the mineral kingdom, and becomes the life which vivifies that--for there is a life in the mineral kingdom just as much as in the vegetable or the animal, although it is in conditions where it cannot manifest so freely.

In the course of the mineral evolution the downward pressure causes it to identify itself in the same way with the etheric matter of the physical world, and from that to ensoul the denser matter of such minerals as are perceptible to our senses.
In the mineral kingdom we include not only what are usually called minerals, but also liquids, gases and many etheric substances the existence of which is unknown to western science.