Now what is a Monad? And what relation does it bear to an Atom? The following reply is based upon the explanations given in answer to these questions in the above‐cited article, “The Mineral Monad,” written by the author. To the second question it is answered:

None whatever to the atom or molecule as at present existing in the scientific conception. It can neither be compared with the microscopic organisms, once classed among polygastric infusoria, and now regarded as vegetable, and classed among algæ; nor is it quite the _monas_ of the Peripatetics. Physically or constitutionally the Mineral Monad differs, of course, from the Human Monad, which is not physical, nor can its constitution be rendered by chemical symbols and elements.(292)

The Secret Doctrine, Vol. 1 of 4 — Part 159

In short, as the Spiritual Monad is One, Universal, Boundless and Impartite, whose Rays, nevertheless, form what we, in our ignorance, call the “Individual Monads” of men, so the Mineral Monad—being at the opposite curve of the circle—is also One, and from it proceed the countless physical atoms, which Science is beginning to regard as individualized.

The Secret Doctrine, Vol. 1 of 4 — Part 159

Otherwise how could one account for, and explain mathematically, the evolutionary and spiral progress of the four kingdoms? The Monad is the combination of the last two principles in man, the sixth and the seventh, and, properly speaking, the term “Human Monad” applies only to the Dual Soul (Âtmâ‐Buddhi), not to its highest spiritual vivifying principle, Âtmâ, alone. But since the Spiritual Soul, if divorced from the latter (Âtmâ), could have no existence, no being, it has thus been called.... Now the Monadic, or rather Cosmic, Essence, if such a term be permitted, in the mineral, vegetable and animal, though the same throughout the series of cycles, from the lowest elemental up to the Deva kingdom, yet differs in the scale of progression. It would be very misleading to imagine a Monad as a separate Entity, trailing its slow way in a distinct path through the lower kingdoms, and after an incalculable series of transformations flowering into a human being; in short, that the Monad of a Humboldt dates back to the Monad of an atom of hornblende. Instead of saying a “Mineral Monad,” the more correct phraseology in Physical Science, which differentiates every atom, would of course have been to call it “the Monad manifesting in that form of Prakriti called ‘the Mineral Kingdom’.” The atom, as represented in the ordinary scientific hypothesis, is not a particle of something, animated by a psychic something, destined after æons to blossom into a man. But it is a concrete manifestation of the Universal Energy, which itself has not yet become individualized; a sequential manifestation of the one Universal Monas. The Ocean of Matter does not divide into its potential and constituent drops, until the sweep of the life‐impulse reaches the evolutionary stage of man‐ birth. The tendency towards segregation into individual Monads is gradual, and in the higher animals comes almost to the point. The Peripatetics applied the word Monas to the whole Kosmos, in the pantheistic sense; and the Occultists, while accepting this thought for convenience sake, distinguish the progressive stages of the evolution of the concrete from the abstract, by terms of which the “Mineral, Vegetable, Animal Monad,” etc., are examples. The term merely means that the tidal wave of spiritual evolution is passing through that arc of its circuit. The “Monadic Essence” begins to imperceptibly differentiate towards individual consciousness in the vegetable kingdom. As the Monads are uncompounded things, as correctly defined by Leibnitz, it is the Spiritual Essence which vivifies them in their degrees of differentiation, which properly constitutes the Monad—not the atomic aggregation, which is only the vehicle and the substance through which thrill the lower and the higher degrees of intelligence.(293)

The Secret Doctrine, Vol. 1 of 4 — Part 159