592 BACTERIA IN INFECTIOUS DISEASES. 



scribes as being three to four times as large. Inoculations in animals were 

 without result, but two inoculations upon his own hand produced a dark-red 

 tumefaction in the vicinity of the point of inoculation resembling that in the 

 individuals from whom he obtained his cultures. 



In two cases of " polymorphous erythema" Haushalter (1887) isolated a 

 streptococcus which did not produce an erysipelatous inflammation when in- 

 oculated into the ear of rabbits, and which he supposed to be a different 

 species (?) from the now better known Streptococcus pyogenes. In five cases 

 of erythema nodosum in children Demme obtained a bacillus which his inocu- 

 lation experiments proved to be pathogenic, and which was perhaps con- 

 cerned in the etiology of the skin affection from which his cultures were ob- 

 tained (see Bacillus of Demme, No. 107). 



Finger (1892) has reported a case in which there was also an extensive 

 diphtheritic process in the throat, and metastatic abscesses in the kidneys 

 and myocardium from which Streptococcus pyogenes was obtained in pure 

 cultures. In the erythema papules, also, were found great masses of strep- 

 tococci, exclusively in the blood-vessels and filling the capillaries of the pap- 

 illary bodies as if by an injection mass. In erysipelas the streptococcus is 

 not found in the blood-vessels, but invades the lymph channels. 



FARCY IN CATTLE. 

 See Bacillus of Nocard (No. 60). 



FISH, INFECTIOUS DISEASES OF. 



See Bacillus piscicidus (No. 173), Bacillus piscicidus agilis (No. 167), Bacil- 

 lus of Emmerich and Weibel (No. 169). 



FOOT AND MOUTH DISEASE. 

 See Eczema epizob'tica. 



FOWL CHOLERA. 

 Due to infection by Bacillus septicaemias hemorrhagicae (No. 61). 



FURUNCULOSIS. 



Due to infection by the ordinary pus cocci (Nos. 1, 2, 5), and especially by 

 Staphylococcus pyogenes aureus. 



FROGS, INFECTIOUS DISEASES OF. 

 See Bacillus hydrophilus fuscus, of Sanarelli (No. 81). 



GANGRENE. 



When the vital resistance of the tissues is impaired by malnutrition and 

 pressure, or by an impaired blood supply from any cause, an invasion by 

 saprophytic bacteria is liable to occur and a more or less extensive gangrene 

 results. It is probable that the infectious disease known as ''hospital gan- 

 grene" is due to common saprophytes which have attained increased patho- 

 genic virulence as a result of special conditions relating to their environment 

 in suppurating wounds. This has not, however, been demonstrated, and itn 

 possible that the development of an epidemic of hospital gangrene is due to 

 the introduction of some pathogenic microorganism different from those 

 usually found in the secretions of wounds and which has the power of invad- 

 ing healthy tissues when introduced into an open wound. 



