PREFACE TO THE GERMAN EDITION. 1 



THE knowledge of Parasites, a knowledge which interests the 

 medical practitioner, as well as the pathological anatomist, is 

 usually treated of either in larger or smaller fragments, both in 

 manuals of pathology and therapeutics, as well as text-books of 

 pathological anatomy. The conviction that, notwithstanding the 

 admirable contributions of various writers, much still remains 

 to be done; the attempts of recent pathological anatomists, as, 

 for instance, Forster, to get rid of this branch of science entirely 

 from the text-books of pathological anatomy; the necessity 

 which has been felt at different periods for special works upon 

 the human parasites, such as have been produced by Bremser, 

 Delle Chiaje, and others ; the opinion, which is certainly shared 

 by all, that these last- mentioned works are antiquated; and, 

 finally, the individuality which this branch of natural history has 

 acquired of late years, induce me to furnish the public, whether 

 interested practically or theoretically in the subject, with a text- 

 book and manual treating of the parasites of the human body, in 

 a manner corresponding to the requirements of the present day, 

 and illustrated with explanatory plates. 



The plan of the book itself is as follows : In the first division 

 I shall treat of the Animal Parasites, and this will be founded, as 

 far as it was possible in my native country, upon my own investi- 

 gations; I shall begin with the Cestoidea, upon which I shall 



1 This preface appeared in the first German edition of the work, and was published 

 with the first part of the first half of the work. 



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