XL] BACILLUS : PATHOGENIC FORMS. 121 



slightly thicker than those just mentioned. They form con- 

 tinuous masses, both in the capillaries and in the minute 

 veins, amounting in some cases to veritable emboli. They 

 occur isolated or in short chains, their length about 0*00 1 to 

 0*0025 nim., their thickness about 0*0003 to 0*0005 mm - 

 Arloing and Chauveau (mentioned in the British Medical 

 Journal, Jan. 12, 1884) found in gangrenous septicaemia 

 around wounds short bacilli, some containing one or two 

 spores, which they consider as the true cause of the gangrene. 

 They are destroyed when fresh by a temperature varying 

 between 90 and 100 C. ; after drying, a temperature of 

 i20C. is required. 



FIG. 56. FROM A SECTION THROUGH THE MESENTERIC GLAND OF A PERSON 

 WHO DIED OF TYPHOID FEVER. 



1. Capillary blood-vessel filled with blood-corpuscles. 



2. Large lymph-cell. 

 3- Nuclei. 



4. Bacilli. 



Magnifying power 700. 



(c) Bacillus of typhoid fever of man. Klebs 1 described in 

 the inflamed Peyer's glands, in the mesenteric glands, larynx, 

 and lungs of patients dead of typhoid fever, certain bacilli, 

 which are about 0*0002 mm. thick and of various lengths, 

 forming filaments up to 0*05 mm. long. These bacilli form 

 1 Archivf. exp. Path. vol. xii. 



