TRICHINOSIS. 



77 



stance of which degenerates, whilst a rapid increase of the nuclei 

 may be seen to take place. Sometimes the larvse are carried 

 along in the blood. At first the young lie straight in the muscles, 

 but in about two weeks they form a kind of citron-shaped capsule 

 in which they coil themselves up (fig. 28, a). This capsule is 

 derived from the degenerating connective tissue of the muscle 

 fibre. Gradually the capsule becomes thickened by the deposi- 



FiQ. 28.— Trtchinella spiralis. 



A, Piece of diseased pork (much enlargi'd) : en, eyst ; c.c, rapsule ; w, encysted worm. 

 15, Larva, c, Male. D, Digestive and sexual organs of ^ (after Colin) : oe, tesophagus ; 

 mi, mid-gut ; r, rectum ; T, testis ; rci, vas deferens ; c, cloaca. 



tion of calcareous matter. One can feel the gritty-like bodies 

 when one cuts a piece of meat full of trichinae with a knife. 

 The yonug asexual muscle spirales can remain in this position 

 any length of time. But if the diseased flesh is eaten by a car- 

 nivorous animal, the gastric juice dissolves the cyst, and the freed 

 worm becomes sexually mature in the intestines in a few days, 

 the sexual organs (fig. 28, d, T and vd) having been partly formed 

 whilst in the muscle. Man, by eating this diseased pork, con- 



