MEASLES IN THE PIG. 345 



many distinct vessels. A rudimentary head soon appears, 

 and then a row of hooks, and, lastly, suckers around them 

 develope. Each cysticercus is enveloped in a cyst, its body 

 grows, and is in reality drawn into the bladder, with which 

 it is continuous at the opening, so that the vesicle proper to 

 the animal is in reality the tail. Cysticerci continue to grow 

 for four or five months, but then remain stationary, and, 

 although occasionally killing the animal in whose flesh they 

 have accumulated in countless numbers, they usually have no 

 means of escape until the natural term of the pig's existence is 

 at an end, and then they pass into the bodies of human beings. 



I have seen pigs, in whose flesh cysticerci abounded, in 

 apparently the most perfect health, and very fat. Indeed, it 

 is necessary to examine an animal closely during life in order 

 to determine if it be measly. The parasites are usually 

 situated superficially under the tongue, and may be felt on 

 the inner side of the eyelids. In very severe cases the neck 

 is swollen, there is difficult breathing, and a hoarse voice. It 

 is a mistake to suppose that measly pigs have red spots on 

 the skin, or any sign of cutaneous eruption. 



After death the presence of cysticerci is easily seen in the 

 different muscles, and in the internal organs. It is especially 

 when a pig is cut into two halves, and the muscles of the 

 neck are cut through, that the greatest mass of these para- 

 sites is exposed. The pork butchers usually make an incision 

 into the psoas muscles to determine if a pig is measly. The 

 presence of many cysticerci in the flesh leads to an open 

 condition of the texture favourable to the imbibition of fluids, 

 and for this reason measly pigs are easily pickled. 



My inquiries indicate that measles prevails to a much 

 larger extent in Ireland than in Britain, and may be regarded, 

 in fact, as enzootic in the former country. I have been in- 

 formed by a Wiltshire bacon factor that not one pig in a 



