DISEASES DUE TO EPIZOA. 727 



The larva, at first wliite, smooth, and transparent, enlarges, 

 becomes brown in colour, and when it has attained its full 

 growth, effects its escape from the abscess by pressing against 

 the external opening ; and finally wriggles itself out, drops to 

 the ground, and, seeking a convenient retreat, becomes a chry- 

 salis, and then a fly. 



Bots are found under the skin of domesticated and other 

 animals besides the ox, and also in man. 



The tumours caused by the bots in cattle are sometimes of 

 the size of a walnut, generally situated upon the back and 

 shoulders. They are easily cured by pressing out the bot with 

 the fingers. 



MAGGOTS. 



Maggots, or " the fly," are very troublesome to sheep in the 

 sultry montlis of the year. They are the larvae of t]ie large 

 blow-fly hatched from its ova, deposited in the fleeces of the 

 sheep, particularly about the rump and tail of the animal when 

 in a dirty condition ; the filth forming a proper habitat for the 

 growth of the insect. The maggots burrow into the skin, render 

 it sore, causing suppuration and deep fissures. The sheep 

 suffers greatly, loses its appetite, is dull, and dejected ; and 

 unless the maggots are destroyed, and the wounds kept clean, 

 death may result. In Australia tliis is a great pest, and 

 not only are sheep liable to be fly-blowm, but men are often 

 attacked by the fly, and have their noses and mouths filled with 

 maggots. 



Sores of all kinds are liable to be fly-blown in the summer 

 time in this country, and wounds of tlie feet are very often 

 found at this time of the year to contain maggots. 



The best remedy for the destruction of the maggot is a com- 

 bination of one part of oil of turpentine to three parts of oil. 



