LECTURE XVIII. 



Imaginary or Spurious Instances of Parasitism Pseudhelminths 

 sometimes Real Bots, Maggots, and other Larvae of Insects 

 These Cases often connected with Hysteria Canes LXXI. to 

 LXXV. 



GENTLEMEN, Tempting as this subject of trichina 

 is, I cannot longer dwell upon it, nor upon the 

 other forms of nematode parasites which are only 

 rarely encountered in actual practice. In truth, it 

 is, after all, a thorough knowledge of the commoner 

 forms of parasitism which you most jequire, and 

 it is on that account that I purposely dwell only 

 very briefly on the obscurer forms of helminthiasis. 

 Whilst recording the previous cases I dare say you 

 will have remarked that a large proportion of these 

 alleged sufferers from tapeworm, threadworm, and 

 round worm were altogether under a delusion. Of 

 these, several had at some time or other been 

 plagued with parasites, and had got rid of their 

 enemies without being aware of it, whilst others 

 were deluded from the beginning. On the other 

 hand, my experiences have shown or confirmed 

 what many of you probably knew well enough 

 before, that not a few people go about with en- 



