274 Management and Treatment of the Horse. 



worm is as common as that derived from beef.'' 

 Professor Cobbold says, '^ I can speak quite con- 

 fidently on this point, because I have investigated 

 this subject very carefully. The beef tapeworm 

 has four suckers, but no hooks. The one from 

 pork is recognized by its head having a series of 

 hooks in addition to four suckers, Tcenia solium,''^ 

 The tapeworm is a most remarkable creature ; it 

 consists of a head and a segmented body, which 

 is sometimes twenty feet long or more ; each of 

 its joints or segments is what Professor Huxley 

 would term a zooid ; it is a sort of semi-indepen- 

 dent whole ; in fact, a tapeworm is not a single 

 creature, but a multitude of creatures, all arranged 

 together in single file. You probably have made 

 acquaintance with those pretty objects which are 

 found on the sea- shore, the zoophyte or polypus, 

 with its numerous heads. Xow, the compound 

 polypus is a colony of individuals, branching out 

 like a tree ; but the tapeworm is a colony of poly- 

 pus ranged together in a single file like a regiment 

 of soldiers, and thus one long creature is produced 

 by a number of little beings adhering together. 

 Some 1200 individuals are here joined together 

 so as to form a colony. Professor Cobbold says, — 

 ^^ I will explain something specially peculiar and 

 interesting about the tapeworm. I have per- 

 formed a series of experiments which have resulted 

 in giving us a more perfect knowledge of the 

 entire life, history, and mode of development of 

 the beef tapeworm. I will explain to you one 

 kind of experiment I made. I took a portion of 

 a tapeworm comprising several of the joints or 



