EEAEING HELMINTHES FEEDING EXPEEIMENTS 



123 



effected by means of numerous transformations. These take place 

 during the fourteen days following infection and are characterized by 

 repeated sloughings. Some of the transformation forms are given 

 in fig. 46. 



FIG. 46. 1, Larva of Strongyloides stercoralis. 2, Larva of Ankylostoma duodenale. 

 (After Leichtenstern. ) 3, Ankylostoma duodenale, four days after its introduction into 

 the body of a dog ; 190 : 1. 4, The same, at the commencement of the second developmental 

 stage (56 days) ; 105 : 1. 5, Two weeks after introduction into the body of a dog ; the 

 parasite is shown in the act of sloughing ; 42 : 1. (After Looss.) 



Ankylostoma may also enter their host by way of the skin. Looss 

 proved this conclusively by experiments upon himself with water 



