146 HEEPETIC AND BULLOUS EEUPTIONS. 



disposed in a circular form around the trunk of the body; 

 herpes circinatus is characterized by the disposition of indi- 

 vidual vesicles in the form of a circle; and herpes iris pre- 

 sents the same peculiarity in the form of concentric circles." 

 WILSON. 



HEEPES PHLYCTENODES. PHLYCTENOID TETTEE OF THE 

 HOESE. This skin affection was first described in 1840 by 

 a French veterinarian, Dard, under the name of 'Rhinite 

 pemphygoide ;' and in 1843 Professor Bouley of Alfort, and 

 M. Patt4 a Parisian veterinary surgeon, published two papers 

 on skin diseases in animals, one of which was principally 

 devoted to the form of tetter, which they had found to be 

 most common in the horse, and which they declared was of 

 the phlyctenoid variety. 



It is characterized by the eruption on a usually circum- 

 scribed surface of agglomerated vesicles, which are in great 

 part so small and transitory as to require careful observa- 

 tion during their development, in order to see them ; there 

 are some, however, usually two or three larger, and about 

 the size of a pea, and elongated. If the portion of skin 

 affected is only thinly coated with hair, the nature of the 

 eruption is readily made out. When, on the other hand, a 

 group of herpetic vesicles forms where the hairy coat is dense, 

 the hairs are seen to stand erect in clusters, and cannot be 

 smoothed down. At the same time there is considerable 

 irritation of the part, and scabs form which entangle the 

 hairs. The hairs and scabs then fall off together, and violet- 

 coloured, tender, or irritable patches of skin remain exposed. 

 Occasionally the affected surface ulcerates, though most com- 

 monly the skin soon regains its normal character, and the hairs 

 grow again. 



Herpes phlyctenodes is apt to attack the lips, face, and even 

 the Schneiderian membrane, so that it has been improperly 



