. The elements of pathological histology with special reference to practical methods . action of the Diplo-coccus pneumonice has a tendency to spread rapidly over considerablesections of the lungs, but may sometimes also take a more focalform, especially when occurring in the course of other infective ^ Other bacteria also may possibly play a causative part in some cases. LOBAR PNEUMONIA 277 diseases. The latter mode of appearance is especially characteristicof pulmonary inflammations caused by the Streptococciis or Staphylo-coccus pyogenes. In all these pneumonias we find in the alveoli, alve
. The elements of pathological histology with special reference to practical methods . action of the Diplo-coccus pneumonice has a tendency to spread rapidly over considerablesections of the lungs, but may sometimes also take a more focalform, especially when occurring in the course of other infective ^ Other bacteria also may possibly play a causative part in some cases. LOBAR PNEUMONIA 277 diseases. The latter mode of appearance is especially characteristicof pulmonary inflammations caused by the Streptococciis or Staphylo-coccus pyogenes. In all these pneumonias we find in the alveoli, alveolar passages,and bronchioles, an exudation of somewhat variable the commencement it is merely serous, , in sections of hardenedpreparations a finely granular mass is found with which are mingledisolated leucocytes, as well as desquamated epithelial cells, eitherlarge and squamous or small, and not uncommonly containing fat-droplets. The capillaries in the walls of the alveoli are also turgidwith blood at this stage. Later (Fig. 138), not only do the leuco- — c. Fig. 138.—Croupous Pneumonia in the stage of Red Hepatisation. Portion of apulmonary alveolus, x 975. (Weigerts modification of Grams method.) a, Capillaryof the alveolar wall, filled with blood; h, Mononuclear and polynuclear leucocytes,some of them containing pneumococci; c. Fibrinous network; d, Round and elon-gated pneumococci, with capsules. cytes (b) in the exudation increase in numbers, but besides redcorpuscles there appear more or less abundant fibrin-filaments (c),delicate and difficult to recognise, or thick and with sharp outlines;and this is especially the case in pulmonary inflammations due to theDiplococcus pneumonice, whereas in pneumonia excited by the Strepto-coccus or Stctphylococcus pyocjenes the exudation is much less rich infibrin. The red corpuscles in the exudation and the hypera^miccondition of the capillaries (a) give the inflamed pulmonary tissueits red colour, whilst th
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpatholo, bookyear1895
