. Pathological technique; a practical manual for workers in pathological histology and bacteriology. Fig. 37.—Streptococcus viridans in a section from a cardiac vegetation; X 1000(W. H. Smith and L. S. Brown). 262 PATHOLOGICAL TECHNLQUE. the blood of the various internal organs after death. It alsooccurs in a certain proportion of cases of peritonitis, pleu-ritis, meningitis, endocarditis, and otitis media. In endocar-ditis, masses of the micro-organisms may form a large partof the substance of the cardiac vegetations. Gaining entranceto the tissues through an insignificant wound or abrasion o
. Pathological technique; a practical manual for workers in pathological histology and bacteriology. Fig. 37.—Streptococcus viridans in a section from a cardiac vegetation; X 1000(W. H. Smith and L. S. Brown). 262 PATHOLOGICAL TECHNLQUE. the blood of the various internal organs after death. It alsooccurs in a certain proportion of cases of peritonitis, pleu-ritis, meningitis, endocarditis, and otitis media. In endocar-ditis, masses of the micro-organisms may form a large partof the substance of the cardiac vegetations. Gaining entranceto the tissues through an insignificant wound or abrasion ofthe skin, it may produce a rapidly fatal septicemia in a sus-ceptible individual, in whose internal organs at autopsy largenumbers of the organism will be found. This general inva-sion of the circulation may also be observed in cases ofchronic or wasting disease, the infection occurring duringthe last days or_ hours of life (terminal infection).. Fig. 38.—Streptococcus viridans showing capsules in a section of a cardiac vegeta-tion; X 1500 (W. H. Smith; photo by L. S. Brown). Of other conditions in which it may occur, hepatic abscess,appendicitis, osteomyelitis, and synovitis may be the streptococcus is distinctly one of the pus-pro-ducing bacteria, yet the inflammations of the soft parts ofthe extremities which are produced by it are generally cha-racterized more by necrosis and serous or hemorrhagic exu-dation and infiltration than by the breaking down of tissueand frank pus-production. In this the organism is in markedcontrast to the staphylococcus pyogenes aureus, whichpractically always produces dissolution of tissue and , the streptococcus inflammations are more com-monly accompanied by lymphangitis than are those due tothe staphylococcus pyogenes aureus. PATHOGENIC BACTERIA AND FUNGI. 263 In a few instances we have met with a streptococcus whosecolonies assume a well-marked yellow color
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