Note 108 — Chapter V · The Alcoholic Ferments. (continued 2)

We insist on this fact, that Fig. 50 represents the forms on revival of the aërobian ferment of saccharomyces pastorianus, when this has grown in a mineral medium. When produced on the surface of fermented wort, the aërobian ferment of which we are speaking presents no peculiarity, nor is there any irregularity in its forms or in its development, and when we proceed to cultivate it in a natural saccharine medium, or in wort, it does not produce any forms of dematium, as in the preceding case; but the reason of this is that, in consequence of the nature of the first medium, which is better adapted to its nutrition, it assumes at once, in the second medium, the forms of deposit-yeast in the course of ordinary germination.