126 UKTICARIA. LICHEN. 



Urticaria has been -described by Rychner as occasionally 

 occurring in cattle. The swellings appear suddenly, and 

 the hair is apt to fall off them in a few days. The eruption 

 disappears in about a fortnight. Haubner has described a 

 similar disease in the pig. 



ROSEOLA is another of the skin eruptions classed with those 

 just described, but we have no information concerning its 

 occurrence in the lower animals. 



LICHENOUS OR PAPULOUS ERUPTIONS. 



Three diseases are described under this head by authors 

 on human skin affections. In the lower animals we usually 

 recognise but one, viz., Prurigo ; but Professor Haubner, of 

 Dresden, has furnished a description of lichen as it occasion- 

 ally occurs. 



LICHEN. 



This consists in the development of pimples, about the 

 size of millet seeds, on the surface of the skin. The Germans 

 have described the malady under the title Schwind-Flechte. 

 Hering declares that it is common, but always benignant. 

 The malady would seem to be the same as the one described 

 in man under the name ' lichen pilaris/ in which the pimples 

 are developed around the openings of the hair-follicles, as it is 

 declared to occur chiefly when animals shed their coat in the 

 spring months. 



The eruption occurs in the form of small pimples, and on 

 the hairs falling off the skin remains rough and bare. 

 Haubner describes two varieties of the disease, viz., lichen 

 cinereus and lichen albescens. 



The patches of eruption are numerous and about half an 

 inch io diameter. They remain unaltered for five or six 



