PREFACE TO THIRD EDITION. 



The second edition of Animal Parasites and Para- 

 sitic Diseases has been exhausted. The demand for 

 this Httle concise work has far exceeded the expecta- 

 tion of the author and pubHsher. The illustrations 

 which have been so useful have been increased in 

 number. Four pages of photomicrographs of the 

 Strongylus-Armatus group have been added and the 

 chapter rewritten bringing the work down to date. 



The work is divided into four chapters, treating 

 on the following subjects, viz.; External Parasites, 

 Internal Parasites, Protozoa, Preparation of Speci- 

 mens. An addenda, on the present status of our 

 knowledge of the chemistry of animal parasites, has 

 been added. 



The names of the parasites are arranged in tabular 

 form at the beginning of each of the first three 

 chapters. In the first column of the table will be 

 found the Branch ; in the second the Class ; in the 

 third the Order; in the fourth the Family; and in 

 the last the Genus and Species, names by which we 

 know the parasites. By reference to this table one 

 cain trace each species at a glance down through the 

 classification to the starting point, — the Branch. 



in 



