W CLINICAL DIAGNOSTICS. 



Trichorrhexis nodosa is a disease characterized by the forma- 

 tion of nodular enlargements along the shaft of the hair. The 

 hair breaks off at the nodule, leaving a brush-like stump behind. 

 Contagious. 



IV. Acute Exanthemas. 



1. Foot and mouth disease [said not to occur in the United 

 States], is an acute infectious disease of cloven-hoofed animals, 

 characterized by the appearance of vesicles upon the mucous 

 membrane of the mouth, the skin of the coronet, and in the inter- 

 digital space Period of incubation 1 to 3 days. The disease is 

 attended by moderate fever, salivation, diminished appetite, lame- 

 ness, recumbent position. The vesicles rupture, leaving erosions 



Fig-. 15. —Urticaria. 



on the mucous membranes, and dry scabs on the skin. Complica- 

 tions are not infrequent. 



