Iv PREFACE. 
Each parasite is dealt with in the order of the 
tabulation. 
The facts about each are noted under the headings: 
Synonym, Distribution, Life Cycle, Animals In- 
fested, Parts Infested, Conditions Produced and 
Treatment. (The latter when treatment is of any 
avail.) 
The photomicrographs are made by myself with 
an ordinary kodak placed over the occular lense of 
the microscope and given time exposure. By gas- 
light the exposure was from three to five minutes. 
As there have been no attempts made to cite any 
authorities in the text, the writer herewith expresses 
his obligations to the writings of Professors Law, 
Neumann, Hutyra and Marek, Friedberger and 
Froehner, etc., etc., also to the reports from the U. 
S. Bureau of Animal Industry, Report by Loos on 
Strongiles, published by the Cairo Medical School, 
Extracts from the Experiment Station Record,. Amer- 
ican Veterinary Review, Journal of Comparative 
Pathology, etc., etc. 
THE AUTHOR. 
Spartanburg, S. C., 1914 
