Thus, as this is the fourth incarnation of our chain, the first globe in this incarnation will be 4A, the second 4B, the third 4C, the fourth (which is our Earth) 4D, and so on.
These globes are not all composed of physical matter.

4A contains no matter lower than that of the mental world; it has its counterpart in all the worlds higher than that, but nothing below it.

4B exists in the astral world; but 4C is a physical globe, visible to our telescopes, and is in fact the planet which we know as Mars.

Globe 4D is our own Earth, on which the life-wave of the chain is at present in action.

Globe 4E is the planet which we call Mercury--also in the physical world.