PREFACE TO THIRD EDITION. 
The second edition of Animal Parasites and Para- 
sitic Diseases has been exhausted. The demand for 
this little concise work has far exceeded the expecta- 
tion of the author and publisher. 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 
can trace each species at a glance down through the 
classification to the starting point,—the Branch. 
Wm 
