DOMESTIC ANIMALS. 171 



their effects we must refer the reader to the various in- 

 fectious and contagious diseases mentioned in another 

 part of this work. We shall only consider the most 

 common vegetable and animal species and their effects 

 on the system. 



RINGWORM. 



This is a disease of the skin and is caused by a pecu- 

 liar plant, seen in Fig. 61. This plant causes ringworm 

 in horses, Fig. 62 represents a plant which causes 

 ringworm in poultry. Most of the domestic animals 



'WSK^SL? ^ 



O 



Fig. 61. Parasite causing ringworm in horse. 



are subject to the invasions of this parasite, and I have 

 noticed that in damp climates or in unusually wet sea- 

 sons, especially in hot weather, the disease is much 

 more common than in cold or dry climates or seasons. 

 There are several species of vegetable fungi which 

 cause skin diseases, each giving symptoms somewhat 

 different fro m the other, but as they will require about 

 the same kind of treatment to destroy the plant, I shall 

 describe them all as ringworms. 



