INSECTS INTESTINAL WORMS DIAGRAM G. If) 9 



is caused by a worm of very peculiar form which lives in the brain 

 of the sheep, and which is always found in animals which have 

 died of this disease. It is shaped like a bladder full of water, as 

 large as a nut or a walnut. It does not move, and is not at first 

 recognized as a worm, but nevertheless is one. When this bladder 

 is opened, several white prolongations are noticed in the interior ; 

 and if one is torn with the point of a pin, we find a head just like 

 that of the tapeworm in the centre of each. 



Other worms live in the flesh, and often in the lard of the hog. 

 They also are bladder-shaped, but not larger than peas, or at most 

 than nuts. Like the worm which produces the staggers, these 

 also have a concealed head exactly like that of the taenia. But 

 the most formidable parasite of the hog is the trichina spiralis, 

 which is found in the muscles, and when taken alive into the 

 human body in any number, has frequently caused speedy death. 

 All worms which thus live in the flesh of animals may become 

 dangerous to man when swallowed, if the meat which contains 

 them has not been sufficiently cooked. All meat used for food 

 ought to be well cooked ; and badly cooked, or only smoked meat, 

 should be avoided. All meat which is suspected to be diseased, 

 or to contain worms, ought to be well boiled for a considerable 

 time, after which it may be eaten with impunity. 



