Xvi THE author's PKEFAGE. 



I have endeavoured to arrange these Lectures with clear- 

 ness and precision, in order to make myself intelligible, 

 and to avoid all confusion and uncertainty. 



I have laboured to comprise in four Lectures, a num- 

 ber of very extensive subjects which are comiected with 

 Inany branches of natural history and medicine. 



I have written them for practitioners and not for nat- 

 uralists ; I have in consequence, but sliglitly announced the 

 articles pertaining to tiie natural histvjry of worms, and 

 have uniformly aimed to speak only of those which are im- 

 mediately related to practical medicine. An exact view 

 of tlie interHal and external parts, composing the body of 

 worms ; the knowledge of the systematic characters in or- 

 der to distinguish the principal worms which inhabit the liv- 

 ing human body ; some reflccthrtis on tlieir origin, so far as 

 they relate to medicine ; the history of the morbid phenom- 

 ena, which at once originate from their birth, as well as 

 certain diseases which are often the cause of their devel- 

 opment ; and lastly a careful examination of the reme- 

 dies proper for their expulsion from tlie body, and suited 

 to prevent their reproduction ; these are the subjects I 

 have treated in these Lectures, which offer matter, for the 

 physician whe reasons, sufficiently vast to enable him to 

 multiply their number as far as he pleases. 



I have not fafled to avail myself of all that the most 

 celebrated writers, naturalists and physicians, have pub- 

 lislied on human worms. To render these Lectures more 

 instructive to my pu|Mls, I have appropriated all the know- 

 ledge of others, and have printed ii without alteration. 

 J have tliought proper to subjoin to each Lecture a num- 

 ber of citations, as it will thence appear from what sources 

 I have derived the most exact information. 



The reader will then he enabled to consult the best pub- 

 lications on the topics I have treated. 



I have annexed to these Lectures five superb plates, 

 engraved with all possible skill and exactness by one of the 



