Stage by stage the type expends itself in ever more elaborate forms of appearance, until in the blossom a triumph of form over matter is reached. A mere continuation of this path could lead to nothing but a loss of all connexion between the plant's superphysical and physical component parts. Thus, to guarantee for the species its continuation in a new generation, the formative power of the type must find a way of linking itself anew to some part of the plant's materiality. This is achieved by the plant's abandoning the union between its two polar growth-principles and re-establishing it again, which in the majority of cases takes place even in such a way that the bearers of the two principles originate from two different organisms.