F. =Bacillus Tuberculosis.=--This organism likewise will receive fuller description in an ensuing chapter. (See Tuberculosis.) The pus of old cold abscesses in which the more obligate pyogenic organisms have long since died usually contains this organism in mildly virulent form. On the other hand, fresh suppurations occurring in connection with tuberculous disease are mixed infections. There is reason to believe, however, that this organism is capable of producing pus even when none of these are present; for example, in that form of acute miliary tuberculosis which is occasionally met with as bone abscess it may be found. G. =Bacillus Anthracis.=--This is one of the most malignant and resistant organisms known, being in the highest degree poisonous for the smaller animals, man being less susceptible. One of its characteristic lesions in the human body is a form of pustule commonly known as _malignant pustule_, the pus in which is usually a pure culture of this organism. (See Anthrax.) H. =Bacillus Mallei.=--This is the organism which produces glanders in the lower animals and in man. That form of the disease known as farcy, in which the infected nodules rapidly break down, is likely to contain pus which will be more or less a pure culture of this organism. I. =Bacillus Lepræ.=--This is the microörganism which produces leprosy, closely resembling the tubercle bacillus. It is constantly and exclusively present in the lesions of leprosy, which are often of the suppurative type, the bacilli being enclosed within pus cells; it is also found in the fluid surrounding them. Although suppuration in these cases may be in a large measure due to secondary infection, it is positive that the leprous bacilli deserve to be grouped in this place. J. =The Bacillus Pneumoniæ of Friedlander.=--The bacillus pneumoniæ of Friedländer was at one time regarded as the cause of croupous pneumonia, which is now known to be due to the micrococcus lanceolatus. The Friedländer bacillus, however, is capable of producing bronchopneumonia, and is occasionally met with in empyema, suppurative meningitis, and inflammations about the nasopharyngeal cavity, of which it is known to be an occasional inhabitant. K. =The Bacillus of Rhinoscleroma.=--A distinctive organism has been described for this disease and given this name. It has such wide morphological differences, however, that it is possible that it is only the bacillus of Friedländer above mentioned. At all events, an organism of this general character is constantly found in this disease in the thickened tissues from the nose (Fig. 8).