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264 PA THOGENIC BA CTERIA.
tive bronchopneuinonia with adhesive inflammation of
the contiguous pleura. After the formation of the pleu-
ritic adhesions the disease may penetrate the newly
formed tissue, extend to the chest-wall, and form external
FIG. 69.—Section of liver from a case of actinomycosis in man (Crookshank).
sinuses. Or it may penetrate the diaphragm and invade
the abdominal organs, causing an interesting and charac-
teristic lesion in the liver and other large viscera (see
• Microscopically the lesion consists chiefly of a round-