214 Ward. — Thames Bacteria , III. 
Similarly when two series meet, the free ends may slip one 
between the other, as in the annexed diagram, or collisions 
may occur. Sometimes such collision results in a bending on 
itself of one of the filaments, and it may snap, or a vortex 
may result, and the filament go round and round in one 
direction for a time as in the diagrams annexed, and so on 
with infinite varieties in the details of the movements. 
Stab-cultures at 18-20° (see Figs. 14 and 15). Good growth 
in the tunnel in twenty-four hours, and a thin film has spread 
over the surface and liquefied the uppermost layer to a slime. 
