Lecture XXVII
In human beings, thinking is localised in the head. With the animal, for instance the tiger, consciousness is on the astral plane. Outside the head what may be called a focal point is formed through which the tiger is affected. When the tiger feels pain this goes over on to the astral plane. With the tiger the organ for this is in front of the head, at the place where the brow is in the case of man. With man this place is already enclosed within the head and it is filled with the frontal brain; consciousness has been imprisoned through the brain and the front part of the skull and is therefore on the physical plane. In the case of the tiger, and indeed of all animals, the focal point of consciousness lies in front of the head, in the astral: from there it goes into the astral world. In the case of the plant things are again different. Could we follow its consciousness, going from above downwards, we would always come out at the tip of the root. If then we were to follow the line of growth, we would come to the centre of the earth. There is the collecting point of all the sensations, the suction point of the consciousness of the plant. It is in direct connection with the mental world. The entire plant world has its consciousness on the mental plane.