147     The same thing is seen in a bar of iron and steel where a slumbering trace of latent magnetic force cannot but be recognized in their interior. Both, after their completion by means of the forge stand upright, repulse the north pole of a magnetic needle with the lower end and attract the south pole, while the upper end shows itself as the south pole of the magnetic needle. But this is only a latent force; not even the finest iron particles can be drawn magnetically or held on either end of such a bar.      Only after this bar of steel is dynamized, rubbing it with a dull file in one direction, will it become a true active powerful magnet, one able to attract iron and steel to itself and impart to another bar of steel by mere contact and even some distance away, magnetic power and this in a higher degree the more it has been rubbed. In the same way will triturating a medicinal substance and shaking of its solution (dynamization, potentation) develop the medicinal powers hidden within and manifest them more and more or if one may say so, spiritualizes the material substance itself.