164 NAVIN OX THE HORSE. 



large as those found under the skin of the ox. The latter is 

 called ^^hijjwderma hovis^^ (skin inhabitant of the ox). The name 

 ^'- hypoderma equi^^ (skin inhabitant of the horse) has been 

 proposed for the former. It does not exceed an inch in length 

 when mature, while that of the ox is from one and a half to 

 two inches. This larva is found principally on horses that 

 have been at pasture in July and August. Its presence 

 causes large, indurated knots, of a conical shape, to appear 

 along the back. If the hair be separated, a small opening or 

 aperture can be found, and a thin matter squeezed out. In 

 the last months of its growth the grub itself may be squeezed 

 out. It takes it ten or eleven months to mature in the skin. 

 Its presence occasions no other disease than the local tumor 

 described. Some troublesome itching may occur in the last 

 stage of the growth of the tumor. 



They are common in the northern part of France, Belgium, 

 and Holland, and along the entire shore of the Baltic and 

 ISTorth Sea. The same treatment used for the similar grub 

 in the ox is best for this. 



MISCELLANEOUS DISEASES. 



SWELLING OF THE LEGS— STOCKINa. 



The legs of the horse are very liable to be attacked by 

 swelling. It occurs much oftener in the hind-legs than in the 

 fore ones. The extent and degree of swelling varies greatly, 

 as also its duration. It also occurs in extremely diiferent 

 conditions of the horse's system. The difficulty which I am 

 now treating of is an acute inflammation of the cellular tis- 

 sue of the legs. There are other kinds of swellings attacking 



