The order in which these powers manifest is declared in the Puranas, Upanishads and Tantric works. It is that abstract formula of evolution which we can apply alike to the great and little things in nature. This may be stated in many ways, but to put it briefly, there is at first one divine Substance-Principle, Flame, Motion or the Great Breath; from this emanate the elements Akasa, ether, fire, air, water and earth; the spiritual quality becoming gradually lessened in these as they are further removed from their divine source; this is the descent into matter, the lowest rung of manifestation. "Having consolidated itself in its last principle as gross matter, it revolves around itself and informs with the seventh emanation of the last, the first and lowest element." (S.D. I, p. 297) This involution of the higher into the lower urges life upwards through the mineral, vegetable, animal and human kingdoms, until it culminates in spiritually and self consciousness. It is not necessary here to go more into detail, it is enough to say that the elements in nature begin as passive qualities, their ethereal nature becomes gross, then positive and finally spiritual, and this abstract formula holds good for everything in nature. These changes which take place in the universe are repeated in man its microcosm, the cosmic force which acts upon matter and builds up systems of suns and planets, working in him repeats itself and builds up a complex organism which corresponds and is correlated with its cosmic counterpart. The individual spirit Purusha dwells in the heart of every creature, its powers ray forth everywhere; they pervade the different principles or vehicles; they act through the organs of sense; they play upon the different plexuses; every principle and organ being specialised as the vehicle for a particular force or state of consciousness. All the sounds we can utter have their significance; they express moods; they create forms; they arouse to active life within ourselves spiritual and psychic forces which are centered in various parts of the body. Hence the whole organism of man is woven through and through with such correspondences; our thoughts, emotions, sensations, the forces we use, colours and sounds acting on different planes are all correlated among themselves, and are also connected with the forces evolving present about us, in which we live and move. We find such correspondences form the subject matter of many Upanishads and other occult treatises; for example in Yajnavalkyasamhita, a treatise on Yoga philosophy, we find the sound "Ra" associated with the element of fire, Tejas Tatwa, with the God Rudra, with a centre in the body just below the heart. Other books add, as correspondences of Tejas Tatwa, that its colour is red, its taste is hot, its form is a triangle and its force is expansion. The correspondences given in different treatises often vary; but what