Chapter 15The Parts of the Body and the Centres · The Ear, Nose, Face and Throat
Book 7. Part Two: The Parts of the Being and the Planes · Section Four: The Chakras or Centres of Consciousness
The heart is the centre of the being and commands the rest, as sense that all flows from it, for it is the psychic being who each time creates a new mind, vital and body for himself.
* There is one centre for the heart, although it is a double centre, in front the emotional, behind the psychic.
* The apex of the psychic and emotional centre (like the apex of all centres) is in the backbone, the base in front in the middle of the sternum.
* The physical heart is in the left side, but the heart centre of Yoga is in the middle of the chest — the cardiac centre.
* I do not quite understand what you mean by soul. The psychic being (which is the soul) does not make centres for itself in the Adhar — the centres are there. The psychic being can take control of the centres that are already there — the heart and the navel centre and the two below the navel. Also the mind and vital are not abolished — they are brought under the psychic influence and psychicised, or they are occupied by the higher consciousness from above and transformed into its instruments.
* The heart-centre is the emotional centre. The navel is the main vital centre. In the abdomen is the lower vital centre. It is in these two that there is the origination of desire — but desire rises and becomes emotional in the heart and mental in the higher centres above.