DISEASES OF CATS 123 



tunately these frequently develop irritation, 

 which produces a diarrhoea in the animal, and 

 the majority of them are carried off. But in 

 other cases some of the worms pierce the in- 

 testines and travel into the muscles of the body. 



Male. Female. 



FIG. 28. TRICHINA SPIRALIS. 



If they exist in small numbers, appreciable 

 symptoms are not visible. If, however, they 

 invade the muscles in large quantities, they 

 produce pains which resemble greatly those of 

 rheumatism, and they may produce a fever 

 lasting for a few days. The invasion, if exces- 

 sive, may produce death. In other cases the 



