Thus, having discovered the effects, Science has to find their _primary_ causes; and this it can never do without the help of the old sciences, of Alchemy, Occult Botany and Physics. We are taught that every physiological change, in addition to pathological phenomena, diseases—nay, life itself, or rather the objective phenomena of life, produced by certain conditions and changes in the tissues of the body, which allow and force life to act in that body—that all this is due to those unseen “Creators” and “Destroyers,” which are called, in such a loose and general way, microbes. It might be supposed that these Fiery Lives and the microbes of Science are identical. This is not true. The Fiery Lives are the seventh and highest sub‐division of the plane of matter, and correspond in the individual with the One Life of the Universe, though only on that plane of matter. The microbes of Science are the first and lowest sub‐division on the second plane—that of material Prâna, or Life. The physical body of man undergoes a complete change of structure every seven years, and its destruction and preservation are due to the alternate functions of the Fiery Lives, as Destroyers and Builders. They are Builders by sacrificing themselves, in the form of vitality, to restrain the destructive influence of the microbes, and, by supplying the microbes with what is necessary, they compel them under that restraint to build up the material body and its cells. They are Destroyers also, when that restraint is removed, and the microbes, unsupplied with vital constructive energy, are left to run riot as destructive agents. Thus, during the first half of a man’s life, the first _five_ periods of seven years each, the Fiery Lives are indirectly engaged in the process of building up man’s material body; Life is on the ascending scale, and the force is used in construction and increase. After this period is passed, the age of retrogression commences, and, the work of the Fiery Lives exhausting their strength, the work of destruction and decrease also commences. An analogy between cosmic events in the descent of Spirit into Matter, for the first half of a Manvantara (planetary as well as human), and its ascent, at the expense of Matter, in the second half, may here be traced. These considerations have to do solely with the plane of matter, but the restraining influence of the Fiery Lives on the lowest sub‐division of the second plane, the microbes, is confirmed by the fact mentioned in the theory of Pasteur above referred to, that the cells of the organs, when they do not find sufficient oxygen for themselves, adapt themselves to that condition and form _ferments_, which, by absorbing oxygen from substances which come in contact with them, produce their destruction. Thus the process is commenced by one cell robbing its neighbour of the source of its vitality, when the supply is insufficient; and the destruction so commenced steadily progresses.