BACILLUS TUSSIS CONVULSIVE 275 



the canal in thrust-cultures, lying one above the other 

 like a pile of discs, the most superficial of which projects 

 in a hemispherical form above the surface (fig. 96). Upon 

 agar and serum, also, round well-defined colonies develop 

 along the inoculated streak, and upon potato a slimy 

 coating forms. White mice die within four weeks after 

 infection. 



Bacillus aureus. — The elements of this bacillus are short 

 rods showing but slight motility. They were found in water 

 by Adametz, and also upon the human skin in some 

 forms of eczema by Unna and Tommasoli. Gelatine is 

 not liquefied. Upon the plate there develop punctiform 

 colonies, which assume a yellow colour and become 

 uneven, and in the thrust-culture a dark yellow deposit 

 forms upon the surface. Their growth on potato takes the 

 form of shining hemispheres, which coalesce and assume 

 a colour varying from dark yellow to brownish-red. 



Tubercle bacillus and Actinomyces. — The micro-organism 

 to which Koch gave the name of tubercle bacillus is con- 

 stantly found in the sputum of phthisical persons and in 

 the contents of cavities ; it has already been described in 

 the chapter on the ' Bacteriological Analysis of Pus ' (p. 206) . 

 The actinomyces fungus, which often occurs in sputum, has 

 also already been described in the same chapter (p. 196). 



Bacillus tnssis convulsivse. — Afanassiew found a micro- 

 organism, which he described under this name, in the 

 sputum of persons suffering from ivhoojniig -cough. The 

 rods are short and actively motile, and best admit of 

 being cultivated at incubation temperature. Gelatine is 

 not liquefied by them. Bounded brown colonies form on 

 the plate and a superficial coating in thrust-cultures, while 

 there develops on agar a thick grey, and on potato a thick 

 brown, deposit. 



Bacillus pneumosepticus. — In the respiratory organs, and 



T 2 



