After we had established the concept of the harmonious-equipotential system in a former chapter, we went on to study the phenomena of the differentiation of it, and in particular the problem of the localisation of all differentiations. Our new concept of the complex-equipotential system is to lead us to an analysis of a different kind: we shall pay special attention to the origin, to the *genesis* of our complex systems that show equipotentiality. If we review the process of ontogenesis, we are able to trace back every complex system to a very small group of cells, and this small group of cells again to one single cell. So in plants the cambium may be shown to have originated in a sort of tissue-rudiment, established at a very early period, and the ovary may be demonstrated to be the outcome of a group of but a few cells, constituting the first visible “Anlage” of the reproductive organs. At the end then, or from another point of view at the beginning, a single cellular element represents the very primordial egg-cell. The whole cambium, there can be no doubt, must be regarded as the result of a consecutive number of cell-divisions of the one cell from which it originates. So must it be with the ovary. The primordial egg-cell has undergone a long line of consecutive divisions; the single eggs are the last result of them. We now proceed to some considerations which have a certain logical similarity to those which inaugurated our analysis of the differentiation of the harmonious-equipotential systems, though the facts in question are very different. Viewed by itself without any kind of prepossessions, as it might be by any one who faces a new problem with the single postulate of introducing new natural entities--to use the scholastic phrase--as little as possible, the development of the single egg might be regarded as proceeding on the foundation of a very complicated sort of machine, exhibiting a different kind of construction in the three chief dimensions of space, as does also the organism which is to be its result.