And though, as shown by those plants that are known as sensitives, there are a few among them that may be regarded as possessing that conscious perception which is called by Leibnitz apperception, while the rest are endowed but with that internal activity which may be called vegetable nerve-sensation (to call it perception would be wrong), yet even the vegetable monad is still the Monad in its second degree of awakening sensation. Leibnitz came several times very near the truth, but defined the monadic evolution incorrectly and often greatly blundered. There are seven kingdoms. The first group comprises three degrees of elementals, or nascent centres of forces--from the first stage of the differentiation of Mulaprakriti to its third degree--i.e., from full unconsciousness to semi-perception; the second or higher group embraces the kingdoms from vegetable to man; the mineral kingdom thus forming the central or turning-point in the degrees of the "Monadic Essence"-- considered as an Evoluting Energy. Three stages in the elemental side; the mineral kingdom; three stages in the objective physical side--these are the seven links of the evolutionary chain. A descent of spirit into matter, equivalent to an ascent in physical evolution; a re-ascent from the deepest depths of materiality (the mineral) towards its status quo ante, with a corresponding dissipation of concrete organisms up to Nirvana--the vanishing point of differentiated matter. Perhaps a simple diagram will aid us:-- [[Diagram here]] The line A D represents the gradual obscuration of spirit as it passes into concrete matter; the point D indicates the evolutionary position of the mineral kingdom from its incipient (d) to its ultimate concretion (a); c, b, a, on the left-hand side of the figure, are the three stages of elemental evolution; i.e., the three successive stages passed by the spiritual impulse (through the elementals--of which little is permitted to be said) before they are imprisoned in the most concrete form of matter; and a, b, c, on the right-hand side, are the three stages of organic life, vegetable, animal, human. What is total obscuration of spirit is complete perfection of its polar antithesis--matter; and this idea is conveyed in the lines A D and D A. The arrows show the line of travel of the evolutionary impulse in entering its vortex and expanding again into the subjectivity of the ABSOLUTE. The central thickest line, d d, is the Mineral Kingdom.