INFLAMMA TION. 



419 



hotic" condition of the kidneys and the liver, f. i., is caused 

 by the transformation of the epithelia into connective tissue, 

 through the intermediate stage of medullary tissue. In suppura- 

 tive inflammation, on the contrary, the connection of the medul- 

 lary elements, which originated in the enlarged epithelia and 

 endothelia, is broken, and the medullary plastids, now termed 

 pus-corpuscles, are freed either by active emigration or by the 

 contraction of the bioplasson of the parent body, which remains 



FIG. 176. BEGINNING OF THE PUSTULAR STAGE IN ILEMORRHAGIC 

 SMALL-POX. 



J), formation of homogeneous lumps from the bioplasson of the cuboidal epithelia ; E, 

 homogeneous and vacuoled lumps suspended in a finely granular, albuminous liquid. C (left), 

 ledges of former cement-substance, the bioplasson of which has considerably increased in 

 bulk ; C (right), deepest layers of epithelia, compressed and rendered spindle-shaped, also 

 with commencing increase of bioplasson. O, papillary layer, flattened and in the condition of 

 redematous swelling. Magnified 600 diameters. 



comparatively little changed. The parent body itself, after the 

 evacuation of the pus-corpuscles, presents a fenestrated appear- 

 ance, with a varying number of vacuoles, indicating the location 

 of the pus-corpuscles, or an apparently empty shell, pierced by 

 delicate septa. All these formations are easily traced in the 

 vesicular and pustular stages of small-pox. (See Fig. 176.) 



Surface epithelia, if present in a single layer, are readily cast 



