GROUSE DISEASE. 



231 



of the intestine, and the liver is congested and dark, but the spleen 

 is not enlarged. The bacilli are found in the heart, lungs, and liver, 

 and in the extravasated blood. 



Cultures inoculated in mice and 

 guinea-pigs produce pneumonia 

 and death. Sparrows are sus- 

 ceptible, and other small birds. 

 Fowls, pigeons, and rabbits are 

 insusceptible. 



Bacillus of Hsemor- 

 rhagic Septicaemia. — Yery 

 short rods, with rounded ends, 

 "6 to "7 /x, in width and 1 '4 /^i in 



length. 









«.v 



( 



Fig. 111.— BaOILLDS of H^MORRHAGICf 



Septicemia. • Blood of a Rabbit after 

 death from Septiosemia x 950 (Baum- 

 gabten). 





In stained preparations the rods 

 are observed to be deeply stained at the 

 ends and to have a clear interval in the 

 middle ; they were on this account mis- 

 taken by earlier observers for dumb-bell 

 micrococci or diplococci. They are non- 

 motile, and spore-formation is unknown. 

 They grow readily in the ordinary media. 

 The colonies in nutrient gelatine appear 

 about the third day. They are circular 

 in form, with a sharp dark outline, and 

 of a yellow colour, lighter at the peri- 

 phery. Later, the central zone is finely 

 granular, and of a dark yellowish-brown 

 colour, with the lighter peripheral zone 

 more clearly defined. In the depth of 

 gelatine a delicate filament develops in 

 the track of the needle, composed of 

 minute spherical colonies, somewhat trans- 

 parent, and yellowish-white in colour. 

 At the point of puncture there may be no 

 growth visible, or a flat and very Kmited 

 growth. Inoculated on the surface of 

 nutrient media a thin layer develops, 

 with an irregular serrated and thickened 

 border. On potato different results have 

 been obtained by different observers. Some maintain, that a 

 greyish- white or yellowish film will develop at the temperature of 

 the blood ; but aecording to Caneva, the bacilli, whatever their source, 



Fig. 112. — Bacillus of 

 hiemobbhagic septicemia 

 (Babbit Septicaemia). Pure- 

 cultm'e in Gelatine after 

 fom- days (Baumgaktbn.) 



