Microscopic examination of sediment shows,—

Bacteria:

Bacteria Bacillus.

Bacteria Vibrio.

Infusoria:

Flagellata Monadina.

Flagellata Euglenia.

Ciliata Enchelia.

Ciliata Bursarina.

Ciliata Parmecia.

Silicious granules.

Small pieces of decaying wood.