438 FOOT AND MOUTH DISEASE 
large areas of the mucous membrane slough off leaving a raw, painful 
surface. Here on section the tissue takes the eosin stain more deeply 
Fie. 100. ToNGUE SHOWING ULCERS AND 
HEALING PROCESSES (Kitt). 
and the nuclei of the cells do 
not stain as well with hema- 
toxylin. The next change 
noted is liquefaction necrosis 
with an infiltration of leuco- 
cytes and blood plasma. The 
necrosis proceeds upward with 
the consequent liquefaction of 
the underlying tissue, until 
the covering epithelium is 
reached. A blister or vesicle 
results which is filled with a 
serous liquid. 
According to Bang the strik- 
ing characteristic of the skin 
lesions is their superficiality. 
It amounts to a simple 
raising of the epidermis or 
Fic. 101. HEART SHOWING YEL- 
LOWISH STREAKS OF DEGENER- 
ATED HEART MUSCLE. (ALBUMI- 
NOID DEGENERATION) (Hebiger). 
