204 ENTOZOA FOUND IN MAN. 



throughout the body that even the smallest muscles, 

 such as those of the larynx and of the eye, were 

 invaded by them. They are generally more nume- 

 rous in the superficial than in the deep-seated 

 muscles, and have been more frequently met with in 

 the pectoralis major and the latissimus dorsi muscles 

 than elsewhere. 



The parts which are affected by the trichina are 

 studded with small white spots which may be easily 

 recognised as vesicles, when they are placed beneath 

 the microscope ; and the worms may then be seen 

 coiled up in the interior of the vesicles. The cysts 

 are arranged, sometimes in groups, and sometimes in 

 a linear series, in the muscular tissue ; occasionally 

 they are isolated. 



The long diameter of the cysts is always parallel 

 to the course of the muscular fibres ; and they 

 adhere loosely to the surrounding areolar tissue, 

 excepting at their prolonged extremities which are 

 always more firmly attached. The muscular fibres, 

 situated in the immediate vicinity of the cysts, are 

 often covered with an oily-albuminous matter ; in 

 other respects, however, they may present a healthy 

 appearance. 



The trichina spiralis has been observed in Europe, 

 and in America. The largest number of cases have 

 been met with in Great Britain, but this greater 

 proportional frequency may be probably due to the 

 fact that attention was first directed in this country 

 to this peculiar entozoon. 



According to the cases which have been hitherto 

 pubhshed, it is evident that the presence of the 

 trichina bears no relation to the age or sex of the 



