Each substance may be called the grouping of the like atoms, for like attracts like. Nature's power of affinity brings each atom closer to its similar one; however far apart they may be. The sole purpose of each atom is to approach and join its own element. This may be seen in the forest and the desert, in the former where there is one tree in time many others grow, and in the latter where there are none, there perhaps never will be. The same is the case with the different minerals, gold is found with gold and coal with coal; all grouped together attracted by their affinity for ages. The atoms of a substance in their finer form being a vibration, this law applies to them. The power of affinity groups the vibrations similarly which is felt and perceived by the mind which we may call thought or feeling. Although the thought has such vibrations which are on their way to being transformed into atoms, every such formation either of spirit or of substance naturally makes a form either fine or gross, even or uneven.