PREFACE. 



IN these Lectures I have not attempted to cover 

 the whole ground of Practical Helminthology ; 

 nevertheless, with the exception of hydatids, I have 

 more or less fully considered all those forms of 

 internal parasitism which ordinarily come under the 

 notice of the physician. 



The first six of these discourses have appeared 

 in the pages of the Medical Times and Gazette; 

 the remainder are entirely new, and have been 

 only very recently delivered. 



To any rightly constituted mind the process of 

 self-assertion is always a painful operation; yet 

 there are circumstances which not merely justify, 

 but actually necessitate such a step in the interests 

 of truth. 



As I have remarked at the close of the chapter 

 on Trichina spiralis, in the supplement to my larger 

 treatise, there are authors " on this side the Channel 

 who systematically ignore the labours of their own 

 countrymen." Acting for myself, therefore, I can 

 only meet such puerile negations of home-work 

 by pointing to the several papers I have contri- 



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