Till-: TAPE WORM. 



51 



from tea to thirty feel in length; there are upward uf 

 eighl hundred joints in :i worm 

 tin feel long. The head ends 

 in a proboscis armed with a 

 doable crown of hooks; the 

 firsl proglottis or sexually ma- 

 ture Begment begins ;it the 

 450th. While in some persons 

 presence of a tape-worm is 

 simply an anuoyance, in ner 

 vous and irritable persons it 

 causes resl lessm ss, undue anx- 

 iety, and various dyspeptic 

 uptoms. Among the pre- 

 vent ive remedies against tape- 

 worms is the disuse of raw or 

 underdone pork, and " measly" 

 pork —i.e., the flesh of swine 

 containing the little bladder- 

 like vesicl Cysticerci, <>r 

 young tape - worms, can be 

 readily disl inguished, bul when 

 thoroughly cooki d are harm- 

 less, as the temperature of 

 boiling water is Bufficienl to 

 kill them. A> a matter of 



■ 



course, in the use of drugs to 

 expel a tape-worm they should 

 be pushed bo as to carry off the 

 entire animal, as new segments 

 grow oui from near the head 

 a< rapidly as the joints are de- 

 tached. 



The history of the human 

 tape-worm. Tmnia solium (Fig- fk 

 53), is as follows: The 





with tlie head magnified £ i 



