" A careful study of the phenomena of the vital force in the organized world leads us to recognize in it the following properties ands laws: the vital force is the most subtle, most penetrating, most invisible agent we have known until now in nature ; in this respect it surpasses even light, electricity and magnetism, with which in other respects it seems to have the greatest analogy...We find a striking analogy between the vital force and magnetism. The life force can exist in a free and latent state, and in this respect has a close analogy to heat and electricity."
