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178 THE MICRO-ORGANISMS OF THE HUMAN MOUTH.

I have found in one ca?^e only the very remarkable mode of
advance represented in Fig. 72. Here the invaders are seen
Fig. 71.
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tiiifil

v90i

jr..
, :
I

Decayed Destixe, showing that laterally the boundary iDetween the infected and non-infected
parts may be viiy regular. Circa 40 : 1.
Fig. 72.

Decayeli JJe.vtine, showing an advance ot thu
bacteria in three columns. Circa L5 : 1.
to advance in a manner which I can only liken to an army of
men marchino^ throuo-h a hostile countrv. Far in advance we