OUR DOMESTICATED ANIMALS. 127 



At some future time I hope to write a compauion 

 manual treating of the external parasites of our domes- 

 ticated animals. 



In conclusion, it only remains for me to express the 

 hope that this very much condensed outline of the forms 

 of internal parasites and the phenomena of parasitism 

 occurring amongst our domesticated animals may prove 

 -a useful point d'appui for the furtherance of a study 

 which, in its singular revelations of hitherto unsuspected 

 causes and effects, has already thrown much light upon 

 the nature of a variety of diseases affecting alike ourselves 

 and the brute creation. 



