i:>t*. 



Tin: ami:i:kan monthly 



\.\\m 



IViumIcs prodiici" iVoni 

 i,qcx)t() J.cKXJcmhrvos, 

 and as thcv arc ten 

 times as miincrous as 

 the males, their lepio- 

 iliiction is rapid. In 

 six tlays the lemales 

 contain perfectly de- 

 \ eloped and liee living 

 embryos, and these 

 pass out at the vajijinal 

 openint; and arc set 

 tree in the intestinal 

 canal of their living 

 host. Being horn with- 

 out any shell, free and 

 active, thev soon com- 

 mence their wander- 

 ings, boring through 



Fio 3 — Section if lU>h sliow.nt; L.ipMiIci biokoii and escape 1 . . , ii • 



ofTrichinsc. ^"^ mtcstmal walls m 



seek i ng p e r m a n e n t 

 lodgment in the muscles of the body. They travel in the coarse 

 intermuscular connective tissue, and their favorite seat is in the 

 sheathed muscles nearest the cavities of the body, more particu- 

 larlv the diaphragm, near its attachments, and in the psoas, or loin 

 muscles of the liack. They sometimes invade, in much less 

 numbers, all the muscles of the body, producing severe pain and 

 stiflhess of the infected parts of the Ixnly. In about 12 or 14 days 



after they have become 

 permanently located in 

 the muscular tissue 

 thev acquire the size 

 and appearance of the 

 '/'rich in iV spiral i s 

 i I'^ig. i). The spot in- 

 habited bythe rolled-up 

 parasites is converted 

 into a spindle-shaped 

 witlening. and within 

 this nest, under the 

 thickened sarcolemma, 

 the formation of the 

 1 e m o n - s h a p e d cyst 

 commences by periph- 

 eric hardening and cal- 

 cification. One cyst 

 may contain from one 



F.... 4 -Showing «cl.o.. of iriduncus meat. ^^ ^j^^^^ wormS. 



The worms become encvsted and enter an inert state after 



