Fig. 22. 



From a section through the hardened spleen of the same guinea-pig as 

 Fig. 21, showing above and below in the figure masses of Malpighian 

 corpuscles ; the rest — the main part of the figure — is spleen pulp with 

 numerous necrotic nodules ; in these nodules are masses (dark) of bacilli. 

 x40. 



Fig. 23. 



One of the baeillary masses of the previous figure more highly magni- 

 fied, x 300. 



Fig. 24. 



One of the baeillary (dark) masses of a necrotic nodule of a guinea-pig 

 dead of subacute plague ; the baeillary masses show a reticulated arrangement, 

 being contained in the blood spaces of the pulp. x 100. 



