In the above figure we should remark the chain of large cells and long-jointed processes, _a_, _b_, _c_, _d_ : _d_ is one of the cells that we sowed; it has become transparent, and its contents, which are slightly granular, have lost their brownish tint; _c_ is a large cell which sprang from the preceding one; its outline is clear, and it is full of fine, yellowish granules, which present a perfect resemblance to the large ferment-cells of fruits, proceeding from the germ-cells on the surface of those fruits, when it begins to appear in sweet juices; _b_ is a long filament, sprung from the preceding cell; and, last of all, _a_ is a joint and its bud, in which the border is not yet very clearly defined; it has scarcely any granules, and is finer than the others, belonging, in short, to the small ferment form represented in Plate XI. Here, then, we see the transition of the large ferment to the small, on the same branch, after two generations from the germination of the germ-cell _d_. This observation corroborates the opinion maintained by us, that in Figs. 33, 34, 36, as in Plate X., we have not a mixture of two ferments, the one consisting of large, elongated filaments, the other of small cells, but one and the same ferment, the differences in the form and size of which depend on particular conditions. The smallest ferment-form very soon becomes the only one visible, and it preserves its peculiar appearance in successive growths from inability to return to the full, elongated, filamentous forms before undergoing a prolonged exhaustion. The ferment of _mucor_ would probably afford similar indications: it would be very interesting to find out. [Illustration: Fig. 37. 1 Div. = 1/450th of millimetre (1/11250th of in.).]