It is an easy matter to trace the germination of these different varieties of cells with the microscope. We put a drop of the water in which the woody part of a bunch of grapes has been washed into a small quantity of wort, previously boiled and filtered bright. Plate IX. presents a series of developments observed in the case of simple or grouped cells, A, D, G, and J. The process is as follows: The yellowish-brown cells soften and grow larger in the nutritive medium, and gradually become almost transparent and colourless. At the same time we see some very young buds appear on their margins; these rapidly increase in size, and detaching themselves to make room for others, move off as young cells that after a time bud in their turn. The rapidity with which these cells bud and multiply is often extraordinary. The group A and the cell D produced the groups C and F within twenty-four hours, passing through the intermediate stages represented in groups B, E. The cells A and D did not give rise to any filamentous growths, at least whilst under our observation. Some groups of cells, however, put forth, from the first, long filaments, having cross-partitions and resembling the mycelium in ordinary fungoid growths. Together with these, and along their whole length, was an abundance of cells, often in clusters, as represented by Fig. G, the whole of which growth took place in less than twenty-four hours.[86] But apart from contact with the air, there was a complete absence of life. [Illustration: Plate 9. Various Examples of the Mode of Growth of Mould-cells from the Outer Surface of Grapes.] The figures H, I, J, K, represent other aspects of developing cells and filaments. The cells H are spherical; the cells I have numerous buds, as also have those marked K. These different forms were all produced in the course of twenty-four hours by the cell which may be observed in the centre of the group J. In connection with this same group, J, we may remark that on September 30, 1872, at 10 A.M., we witnessed the detachment of three oval cells at the points _a_, _b_, _c_; by 10.45 other buds of the size represented in our engraving had formed in their place; by about five o’clock that same afternoon these buds, _a_, _b_, _c_, having become transformed into cells, fell off in their turn.[87]