2IO

PA THOGENIC BA CTERIA.

deuces pro and con point more strongly in the negative
than in the positive direction.

The fragments do not look like the spores of any other
organisms. When spores occur in the continuity of

PJG. go.—Tubercle bacillus in sputum (Frankel and Pfeiffer).

TDacilli, they are generally discrete oval refracting bodies
easily recognized. The fragments seen in the tubercle
bacillus are irregular and biconcave instead of oval, have

fiG, 61.—Tubercle bacilli: I, forms suggesting sporulation; 2, forms de-
scribed as beaded; the open spaces in the fragmented rods are sometimes mis-
taken for spores.

ragged surfaces, and are without the refraction peculiar
to the ordinary spore.

The spaces between the bacillary fragments cannot be
made to stain like the spores of other species. Finally,