RESTFULNESS IN ANIMALS IO3 



to the second the mite which produces sheep scab, and 

 to the third the stomach worm. 



Each class of domestic animals has its own peculiar 

 insect and parasitical foes. The horse is annoyed by many 

 kinds of flies and also by certain skin diseases which pro- 

 duce unrest, although every form of irritation from the 

 itching of the skin does not arise from the presence of 

 insect life. The condition of the blood may produce much 

 irritation. The Bot fly (Gasterophilus equi) is peculiarly 

 the enemy of the horse. 



Prominent among the fly enemies of cattle are the 

 House fly (Muse a domestica), and the Horn fly (Passalus 

 cornutus). They are also annoyed by warbles or grubs 

 which are developed in the fleshy tissues immediately under- 

 neath the skin. They suffer from the presence of lice which 

 irritate by biting. They are also liable to attack from such 

 skin diseases as ringworm and mange, the latter of which 

 is peculiarly harmful, because of the ease with which it 

 is communicated, the extent to which it annoys and the pro- 

 longed treatment oftentimes called for in removing it. 



Sheep are peculiarly liable to attack from a species of 

 the Gad fly (Tabanus ruficornis), which at a certain time of 

 the year sometimes succeeds in depositing eggs in the nos- 

 tril, which give rise to the trouble known as "grub in the 

 head." The Sheep tick (Melophagus ovinus) and the mite 

 (Psoroptcs equi), which produces scab, are peculiarly 

 enemies of sheep. The same is also true of certain par- 

 asitical troubles, such as Tape worm (Bothriocephalus 

 latus), Stomach worm, (Ascaris lumbricoides,) and nodule 

 disease. 



Swine are much subject to attack from lice, which, 

 unless dislodged, go down from one generation to another. 

 They are also subject to mange, and there is no animal 

 probably which suffers so much from the house fly. This 

 arises in part, at least, from the extent to which they are 

 so frequently fed and housed in proximity to surroundings 

 favorable to the breeding of the flies. 



