Fig. 75. 



Keprodueed from a section through the affected Peyer's patch of the 

 ileum of a rat dead of plague after feeding ; seen under a low magnifying 

 power. 



At 1. Piece of "food" (crowded with B. pestis) wedged in and fastened 

 at the pit of the mucous membrane corresponding to the internal portion of 

 the Peyer's gland. 



At 2. A swollen and partially necrotic lymph follicle. 



At 3. Lymph spaces surrounding a large blood-vessel and filled with 

 continuous masses of B. pestis. 



At 4. Lymph vessels filled with B. pestis between the layers of the 

 outer muscular coat. 



At 5. Necrotic mucous membrane filled with extra vasa ted blood and 

 masses of B. pestis. x 25. 



Fig. 76. 



Large blood-vessel of the submucosa (3 of Fig. 75) containing numerous 

 B. pestis amongst the blood corpuscles, surrounded by lymph space filled 

 with B. pestis. x 300. 



