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Bacteria: a, zoogloea of Bacterium termo; b, pellicle of bacteria from surface of beer; c, Bacterium lineola, free; d, zoogloea form of B. lineola.

C. Zoogloea stage of a Micrococcus, forming a close membrane on infusion—Pasteur's Mycoderma.

The zoogloea is formed by active division of single or of several mother-cells, and the progeny appear to go on secreting the cell-wall substance, which then absorbs many times its volume of water, and remains as a consistent matrix, in which the cells come to rest.

C. Reticulate zoogloea of the same.

One of the most remarkable Zoogloeae. phenomena in the life-history of the Schizomycetes is the formation of this zoogloea stage, which corresponds to the "palmella" condition of the lower Algae.