But what Modern Science seems to fail to perceive, is that, differentiated as may have been those simple chemical atoms—which archaic philosophy called “the creators of their respective parents,” fathers, brothers, husbands of their mothers, and these mothers the daughters of their own sons, like Aditi and Daksha, for example—differentiated as these elements were in the beginning, still, they were not the compound bodies known to Science, as they are now. Neither Water, Air, nor Earth (a synonym for solids generally) existed in their present form, representing the only three states of matter recognized by Science; for all these and even Fire are productions already recombined by the atmospheres of completely formed globes, so that in the first periods of the earth’s formation they were something quite _sui generis_. Now that the conditions and laws ruling our Solar System are fully developed, and that the atmosphere of our earth, as of every other globe, has become, so to say, a crucible of its own, Occult Science teaches that there is a perpetual exchange taking place, in space, of molecules, or rather of atoms, correlating, and thus changing their combining equivalents on every planet. Some men of Science, and these among the greatest Physicists and Chemists, begin to suspect this fact, which has been known for ages to the Occultists. The spectroscope shows only the probable similarity (on external evidence) of terrestrial and sidereal substance; it is unable to go any farther, or to show whether or not atoms gravitate towards one another in the same way, and under the same conditions, as they are supposed to do on our planet, physically and chemically. The scale of temperature, from the highest degree to the lowest that can be conceived of, may be imagined to be one and the same in and for the whole Universe; nevertheless, its properties, other than those of dissociation and reässociation, differ on every planet; and thus atoms enter into new forms of existence, undreamed of, and incognizable to, Physical Science. As already expressed in _Five Years of Theosophy_,(256) the essence of cometary matter, for instance, “is totally different from any of the chemical or physical characteristics with which the greatest Chemists and Physicists of the earth are acquainted.” And even that matter, during rapid passage through our atmosphere, undergoes a certain change in its nature.