ENTOZOA IN THE MUSCULAR SYSTEM. 201 



for instance, one of the arms may be affected, or there 

 may be great difficulty of breathing, which becomes 

 gradually worse. 



The disease which is produced by vesicular worms 

 in the spinal cord or canal has been known to last 

 over several months, and even several years, until 

 the patient's constitution is finally undermined, sores 

 form upon the sacrum, and other parts of the body, 

 and the patient dies of exhaustion. 



Chapter XXVIII. 



ENTOZOA IN THE MUSCULAE SYSTEM. 

 The Teichina Spibalis. 



The Trichina spiralis, which exists in the human 

 body, may be regarded as special to the muscular 

 system of animal life, for it has never been found in 

 any other muscles than those which possess striated 

 fibres. 



This entozoon appears, probably on accoimt of its 

 very small size, to have escaped notice until about 

 thirty or forty years since, when it attracted the 

 attention of several English and German anatomists. 

 Its name was given to it by Professor Owen, who 

 made a careful examination into the nature of this 

 parasite in 1835. Siuce this period. Professor Owen 

 states that he has met with several cases in which 

 the T. spiralis was present ; and, so far is it from 



