148     On this account it refers to the increase and stronger development of their power to cause changes in the health of animals and men if these natural substances in this improved state, are brought very near to the living sensitive fibre or come in contact with it (by means of intake or olfaction). Just as a magnetic bar especially if its magnetic force is increased (dynamized) can show magnetic power only in a needle of steel whose pole is near or touches it. The steel itself remains unchanged in the remaining chemical and physical properties and can bring about no changes in other metals (for instance, in brass), just as little as dynamized medicines can have any action upon lifeless things.