Where is the pathogenesis of this drug found ? In Hahnemann's Materia Medica Pura. British Journal of Homoeopathy , Vol. VI. An excellent study is also found in Hartmann's Practical Observations . Where do we obtain this drug ? It grows in Europe, our tincture is made from the whole plant in flower, and in the same manner as described under Aconite , and imported. What is the general action of the drug ? Chamomilla seems to act on the sensory nerves given off from the spinal cord, producing a state of excessive hyperaesthesia. This over-sensitiveness is accompanied y a corresponding mental state, a snappish irritability. It acts prominently also on the digestive tract, and is especially suitable for many complaints of children during the teething period. What are three pervading characteristics of the drug ? 1. The mental state, intolerance of pain, etc.