370 ENTOZOA. 



procured, by thousands, in one or two of the pears, were the result 

 of these experiments. I showed some of these hving larvae to 

 Leuckart, who thought they might be Anguillulm ; and, certainly, I 

 never saw the tadpole-like larv93, as such, out of their shells. The 

 young nematodes, in question, displayed a very different form. As 

 my experiments are in the act of being repeated, I will now say no 

 more on this head. 



Injurious Effects on Man ; Treatment. — Kiichenmeister and Da- 

 vaine have written fully on this part of the subject, and the professional 

 journals both at home and abroad teem with recommendations as 

 to the best methods of getting rid of these troublesome invaders. 

 Undoubtedly these worms occasion great annoyance, and, even, 

 grave consequences, by the irritation they set up during their 

 nocturnal wanderings. People of almost every clime seem to bo 

 liable to their assaults, these pests being as abundant in America 

 as they are well known to be in Europe and Africa. 



As I have before remarked, they are not exclusively confined to 

 children, though most frequently found in young people. The 

 symptoms they give rise to chiefly develop themselves in the 

 evening and at night-time, consisting ordinarily of a painful sense 

 of heat and irritation within and around the anus. These symptoms 

 frequently become excessively distressing, especially when they are 

 accompanied by itching in the neighbouring genito-urinary passages, 

 produced by the migration of the worms about these parts. The 

 local inflammatory symptoms thus set up, occasionally superinduce 

 various sympathetic phenomena, which show themselves in restless- 

 ness, general nervousness, itchings at the nose, involuntary twitch- 

 ings, chorea, convulsions, and, sometimes, epileptiform seizures. 

 Many other local disorders are also set up, especially in cases 

 where they occur at early puberty. The nature of these it is 

 quite unnecessary to enlarge upon, as the subject is fully treated 

 of in purely professional works, as well as by the two authorities 

 above quoted. The same, of course, may also be said in regard to 

 the treatment of tlie thread-worm helminthiasis. These authors, 



