XL] BACILLUS : PATHOGENIC FORMS. 131 



(//) Bacillus of swine plague. In a report to the medical 

 officer of the Local Government Board for 1877-1878, 1 have 

 shown that in this acute infectious disease the lungs, intes- 

 tines, and serous membranes are commonly found affected. 

 The lungs show lobular and lobar pneumonia, the large 

 intestine contains haemorrhages and ulcers, while the serous 

 membranes and lymph-glands are inflamed. Occasionally, 

 but not often, also the skin shows irregular red patches. I 

 have shown that in this disease the diseased organs contain 

 a form of bacillus, which only by its small size differs from 



FIG. 63. FROM A SECTION THROUGH THE INFLAMED INGUINAL LYMPH-GLAND 



OF A PlG DEAD OF SwiNE PLAGUE. 



1. A capillary blood-vessel filled with bacilli. 



2. Reticulum of adenoid tissue. 



3. A lymph-cell. 



Magnifying power 700. (Stained with Spiller's purple.) 



bacillus subtilis. I have also shown that particles of the 

 diseased organs or artificial cultures of this bacillus when 

 inoculated into pigs, mice and rabbits, produce the disease 

 with multiplication of the bacillus, while pigeons, fowls, and 

 guinea-pigs are unaffected by cultivations of the bacilli or by 

 the original virus. 



Pasteur maintains that in an infectious disease of the pig 

 known in France as rouget and chiefly characterised by red 

 patches of the skin there is present in the blood a dumb-bell 



K 2 



