AUTHOR'S PREFACE. vii 



once been found by others, or which, in other respects, are defi- 

 cient in interest. 



The animals employed in experiments by myself and at my 

 own cost were, rabbits, cats, dogs, and a few sheep. The greater 

 part of the pigs and sheep employed, were procured at the expense 

 of the Saxon ministry of the Interior, by Professor Haubner ; a 

 great number of sheep were also provided at the expense of the 

 Agricultural Society of Saxon Lusatia, and by the kindness of 

 individual agriculturalists. Larger animals were not at my com- 

 mand, and I was obliged to console myself by the advice of Saint 

 Francis Xavier, who thought that the wisdom and greatness of 

 the Creator might be recognised even from the consideration of 

 the " pecora minora :" — " si thure non licet, farre litandum est." 



Larger animals (oxen) were employed for rearing Ccenuri by 

 Professor May, in Weyhenstephan, who has had the kindness to 

 inform me of the favorable result. 



It still remains for me to return my public thanks for kind 

 assistance in my endeavours, to the Saxon Ministry of the Interior ; 

 to the Agricultural Society of Saxon Lusatia; to MM. Kind, 

 Von Magnus, Baron von Uckermann, of Lutteritz, Von Mucke, 

 of Niederrennersdorf, and Pastor Karmsen, of Drausendorf, for 

 furnishing me with animals for experiment, and for sending me 

 all sorts of materials for investigation w T ith regard to several 

 animal parasites ; to Dr. Gurlt, of Berlin, for forwarding two 

 female Strongyli for examination, as well as for other desirable 

 Helmintha ; to Professors Luschka and Richter, for sending me 

 Trichina spiralis ; to Professor Griesinger, for Distoma hcemato- 

 bium ; to Professor Leuckart, of Giessen, and Dr. G. R. Wagener, 

 of Berlin, for preparations of Tanice, which have been made use 

 of in part on PI. IV ; to M. Kinne, apothecary of Herrnhut, for 

 the communication on the Tcenia from the Cape of Good Hope; 

 and to Madame Heller, of Hamburg, for furnishing me with 

 several specimens of Tania mediocanellata and Bothriocephalus 

 latus ; also for literary assistance of various kinds to Dr. von 

 Ammon, body-surgeon to his Majesty the King of Saxony, 



