vi AUTHOR'S PREFACE. 



communicate in more detail those observations which I sent at 

 the time, in mice, to the Academy of Sciences in Paris, and in 

 consequence of which the academy decreed me an "honorable 

 mention/' together with a medal of the value of 1500 francs, 

 whilst I was requested by the French savants to proceed with my 

 communications. At the same time those experiments will be 

 reported upon, which the Saxon ministry of the interior, at my 

 request, allowed to be made at its expense, by Professor Haubner 

 at the Veterinary School at Dresden, under my instructions ; as 

 also the experiments made, principally with materials forwarded by 

 me, at Berlin, Copenhagen, Giessen, Louvain, Stuttgart, Vienna, 

 TVeyhenstephan, and recently by M. Kind, of Kleinbautzen, and 

 myself, at the charge of the Agricultural Society of Saxon Lusatia. 

 This will be followed by the section on the Trematoda, with 

 views as to the mode in which man and animals are infected with 

 these parasites, and with this the first half of the first division will 

 conclude. 



The second division will contain the natural history of the 

 Nematoidea, with ideas and experiments upon the progenitors of 

 the Trichina ; that of the parasitic insects, such as Linguatula 

 (Pentastoma), Mites, Lice, and Fleas, in which an examination of 

 the e°-°-s (nits) of the lice upon Peruvian mummies and the heads 

 of Xew Zealanders will be referred to ; and that of the pseudo- 

 parasites. An appendix, consisting of an account of experiments 

 not vet concluded, and other recent materials, with a catalogue of 

 works upon the subject, will conclude this part of the work. 



A second independent division will be formed by the Vegetable 

 parasites; with these I shall give a few special introductory 

 remarks. 



In each separate chapter I shall give both the treatment and 

 the scientific description of the parasites. Most of the figures 

 have been made from specimens prepared by myself; but when 

 perfectly good figures existed, and 1 could make no preparations 

 myself, I have given copies, always naming the author. I have, 

 however, omitted giving copies of those parasites which have only 



