IN SUSCEPTIBLE ANIMALS. 417 



as large. It also produced a greater opacity in peptonized bouillon, and in 

 general showed a more vigorous growth in various nutrient media. It dif- 

 fered also in its pathogenic power, as tested upon rabbits, causing death at a 

 later date or not at all ; and in fatal cases the swelling of the spleen and 

 necrotic foci in the liver, produced by the first-described species, were absent. 



64. BACILLUS OF BELFANTI AND PASCAROLA. 



Synonym. Impf tetanusbacillus. 



Obtained by Belfanti and Pascarola (1888) from the pus of wounds in an 

 individual who succumbed to tetanus. 



Morphology. Bacilli with rounded ends, sometimes so short as to resemble 

 micrococci; resemble the Bacillus septicaemias haemorrhagicae (fowl cholera). 



Stains with the usual aniline colors and also by Gram's method. The 

 ends are commonly more deeply stained than the central portion. 



Biological Characters. An aerobic and facultative anaerobic, non- 

 liquefying^ non-motile bacillus. Spore formation not observed. Grows in 

 the usual culture media at the room temperature. Upon gelatin plates yel- 

 lowish-gray, finely granular, spherical colonies with smooth outlines are 

 developed. In gelatin stick cultures, at 18 to 25 C., at the end of twenty- 

 four hours small, spherical colonies are developed along the line of punc- 

 ture, which are isolated or closely crowded ; upon the surface a rather thin, 

 shining, grayish- white, iridescent, circular layer is formed ; gas is given off 

 which has not a disagreeable odor. Upon the surface of agar elevated, 

 shining, gray colonies develop along the impfstrich, or a gray, shining band 

 is formed which increases in thickness but not in breadth usually less than 

 one-half centimetre broad. Old cultures give off an acid odor. Upon blood 

 serum a thin, white layer is developed along the line of inoculation. Upon 

 potato a thin, white, varnish-like layer is formed. 



Pathogenesis. Very pathogenic for rabbits, guinea-pigs, white mice, and 

 sparrows. Not pathogenic for chickens, pigeons, or geese. 



05. BACILLUS OF SWINE PLAGUE, MARSEILLES. 



Synonyms. Bacillus der Schweineseuche, Marseilles (Rietsch 

 and Jobert) ; Bacillus der Frettchenseuche ferret disease (Eberth 

 and Schimmelbusch) ; Bacillus der Amerikanischen Binderseuche 

 (Caneva) ; Bacillus of spontaneous rabbit septicaemia (Eberth). 



The recent researches of Caneva and of Bunzl-Federn agree as 

 to the identity of the bacillus obtained by Rietsch and Jobert (1887) 

 from swine attacked with a fatal epidemic disease in Marseilles, and 

 the bacillus found by Eberth and Schimmelbusch (1889) in the blood 

 of ferrets suffering from a fatal form of septicaemia studied by them. 

 The first-named bacteriologist also identifies a bacillus supposed 

 by Billings to be the cause of "Texas fever" in cattle (" Ameri- 

 kanische Rinderseuche ") and the bacillus of swine plague (Billings) 

 with the above. Bunzl-Federn obtained cultures of Billings' swine- 

 plague bacillus at two different times. He identifies the one first re- 

 ceived with the bacillus now under consideration, and the other with 

 the bacillus of hog cholera (Salmon). 1 



1 The author named says : ' With reference to the bacillus of swine plague 

 (Billings), I obtained, as did Caneva, a decided production of acid in the cultures 



34 



