Regarded thus, man's nature reveals itself as being endowed with a physical organization, and an etheric organization, which are brought into different relationships by being acted upon by a third organization consisting of forces of the kind here to be studied. At his lower pole these forces co-ordinate the ether and physical organizations in a manner corresponding to the function of the 'sulphur'-pole of the alchemical triad. Here, therefore, the warmth-ether takes the lead and acts in such a way that the higher kinds of ether are able to come to expression in material processes of the body. At the upper pole corresponding forces co-ordinate the physical and ether organizations in a way characteristic of the 'salt'-pole. This gives the lead to the life-ether, so that the physical organism provides the foundation for the activity of the ether-forces without, however, being actually penetrated by them (at least after completion of the embryonic and first post-embryonic development). As a result, consciousness lights up in this part of the body. The rhythmic sphere, being the 'mercurial' middle, is distinguished by an alternation of the two conditions described. With each diastole it becomes more akin to the pole below, and with each systole more akin to the pole above. Here, therefore, the lighting up of consciousness is only partial.