The following is a list of the principal Elements, known to Science, to-day: Aluminum. Antimony. Arsenic. Barium. Bismuth. Boron. Bromine. Cadmium. Calcium. Carbon. Chlorine. Chromium. Cobalt. Copper. Fluorine. Gold. Hydrogen. Iodine. Iron. Lead. Magnesium. Manganese. Mercury. Nickel. Nitrogen. Oxygen. Phosphorus. Platinum. Potassium. Radium. Silicon. Silver. Sodium. Strontium. Sulphur. Tin. Zinc. Of the above, Hydrogen is by far the lightest in weight; in fact it is used as a unit of Atomic Weight, its weight being marked "1" on the scale; Gold, 197; Lead, 207; Silver, 108; Oxygen, 16; Nitrogen, 14; Iron, 56. The discovery of the Corpuscle, or Electron, rudely shattered the vortex-ring theory of the origin of the Atom, and now, instead of the Atom being regarded as a "vortex-ring" in that hypothetical, paradoxical absurdity, the Ether, it is believed to be composed of a vast number of tiny particles called Corpuscles, as we saw stated in our last chapter. These Corpuscles seem to be the "last thing in Substance"--its last known state of refinement, and already it is being proclaimed as the long-sought for "Primal Matter," or "Ultimate Substance." Whether or not a still finer state of Substance will be discovered Science is unable to say, but thinks it unlikely. But we must not overlook the old Occult Teaching indicating a state of Substance so fine that it is imperceptible, and only recognizable as apparently "free force"; its covering, or vehicle of Substance not being evident. This would seem to indicate a still further refinement of Substance, although perhaps the "Corpuscle" or "Electron" will answer to "fill the bill" in the case. As to the Corpuscle being "Primal Substance," it must be admitted that its advocates have presented a very strong case. One of their most important points is that although Molecules differ very materially from each other, according to their kinds; and while Atoms likewise manifest very plainly their "kind," the Corpuscle seems to possess _only one "kind,"_ no matter from what form or "kind" of Substance it is thrown off. Just think what this means. It means that the finest particles of Gold, Silver, Iron, Hydrogen, Oxygen, and all the rest of the Elements, _are composed of identically the same material, and exhibit no differences in_ "_kind_." The Elements are no longer "Simple." _All Substance is One, at the last analysis!_