THE MOST COMMON DISEASES OF SWINE 557 



peat in a week if necessary. A brisk purge will often 

 wash out a number of them. 



LONG THREAD WORM 



"This is found most frequently in some part of the 

 colon and cecum, l)ut sometimes in the small intestines, 

 either loose or witii its anterior capillary portion inserted 

 into the mucous membrane. It is often observed in great 

 numbers in animals that have died from some acute 

 disease. I ha\e found numbers of these worms par- 

 tially buried in the mucous membrane, but they did not 

 seem to have caused much disturbance. They are about 

 Yi inch to lYz inches long, about as thick as a com- 

 mon thread, and are very active in their motion. From 

 experiments that have been made, it appears that the 

 ()\a are never developed in the animal body, but being 

 discharged with the feces, retain their vitality for a 

 long time, and if placed in water, become at the end of 

 about eight and a half months developed into embryos, 

 about 1-300 of an inch in length. It is probable 

 tliat these are carried l)y the rain and other means 

 into streams, wells, etc., whence the drinking water 

 is derived, and thus they become fully developed. 

 There are no particular symptoms by which we can de- 

 lect this worm from others during the life of the animal, 

 and the treatment would be the same as for the Thorn- 

 headed worm. Very often when worm medicine is given, 

 a variety of worms will be discharged at the same time. 



ROUND WORM 



"A round, smooth worm of considerable size; the 

 mrde usually reaches, when fully developed, si.x inches, 



