C. =Micrococcus Lanceolatus.=--Micrococcus lanceolatus is also known as the _diplococcus pneumoniæ_ or the pneumococcus of Fränkel and Weichselbaum, and as the _micrococcus of sputum septicemia_ of Pasteur and of Sternberg. It is of interest to surgeons because it causes many localized inflammations and is a frequent factor in causing septicemia; it is often present in the mouths of healthy individuals. It may produce the various forms of exudates as the result of congestion set up by its presence; also otitis media, meningitis, osteomyelitis, and suppurative disturbance in the periosteum, the salivary glands, the thyroid, the kidney, the endocardium, etc. [Illustration: FIG. 6 Diplococcus pneumoniæ of Fränkel. (Karg and Schmorl.)] D. =The Micrococcus Tetragenus.=--Suppurations produced by these organisms are prolonged, mild in character, not painful, but accompanied by much brawny induration of tissues. E. =The Micrococcus Gonorrhœæ.=--The micrococcus gonorrhœæ, or _gonococcus_, is found constantly in the pus of true gonorrhea, in many cases the pus being a pure culture of this organism. These cocci are generally seen in pairs (biscuit-shaped), while their inclusion within the leukocytes or their attachment in or to epithelial cells is characteristic. Unlike other pyogenic cocci, they do not stain by Gram’s method, being decolorized by iodine, by which fact they may be distinguished. They are cultivated with difficulty, and are known rather by their clinical effects than by their laboratory characteristics; are human parasites, other animals, so far as known, being practically immune. The gonococcus may also produce abscesses, and may be carried to distant parts of the body, where its effects are commonly noted as pyarthrosis, although endocarditis, pericarditis, pleurisy, etc., are known to be due to it, and fatal pyemia has been produced in consequence. In some way it is probably the explanation of the post _gonorrheal arthritis_, wrongly spoken of as gonorrheal rheumatism. F. =The Bacillus Coli Communis or Colon Bacillus.=--This is an inhabitant of the intestinal canal; varies extremely in virulence and somewhat in morphological appearances; coagulates milk; is often associated with other organisms; migrates easily both along the alimentary canal and from it into the surrounding tissues or channels. It is a disturbing element in the production of kidney and hepatic disease, also in the production of appendicitis and peritonitis. Ordinarily its pyogenic properties are not virulent; occasionally, however, it becomes extremely virulent.