DISEASES OF THE HOG. 81 



this and migrate to other parts of the body, where 

 their presence causes great disturbance. The 

 eggs of this worm pass from the hog and are 

 eaten by the grubs of certain large beetles; in the 

 stomach of these grubs the eggs develop into em- 

 bryos, or rather the embryos already developed 

 are set free and bore through the intestine and lo- 

 cate themselves in the body of the grub. Here they 

 become encysted and remain dormant until the 

 grub is eaten by the pig and then once in the stom- 

 ach or intestine of this animal it develops into a 

 worm at once. The color of this worm is white or 

 bluish w^hite, the female being from five to twenty 

 inches in length, while the male is from three to 

 five inches long. The female is very prolific, pro- 

 ducing immense numbers of eggs, which are of a 

 somewhat oblong-oval shape. 



Symptoms: Pigs may have a number of these 

 worms without their causing any noticeable de- 

 rangement; on the other hand they often derange 

 the digestion and assimilation, causing loss of 

 flesh and a general unhealthy appearance. The 

 animal is usually hungry and may eat large quan- 

 tities of food and yet remain thin. When a pig has 

 such symptoms with the absence of any other ail- 

 ment we may suspect that worms are the cause. 

 In very bad cases the pig becomes weak in the loins 

 and the membrane in the corners of the eyes 

 swollen, red and watery; the animal suffers pain, 

 which is indicated by it continually grunting or 

 squealing; such hogs are usually bad tempered 

 and will bite and snarl at the other pigs. In some 



