INFUSORIA. 31 



They pass out on the dung and encyst. When food beoomos 

 soiled by excrement they are taken into the alimentary canal. 

 Another species, B. minutum, has also been recorded in man. 



Enough has been said of this group of simple animals, the 

 most rudimentary forms of animal life that exist, to show that 

 they are of some considerable importance, not only to the 

 farmer and poultryman but to man in general, and that a 

 knowledge of their habits and life - histories is not only of 

 interest but of very great economic value to us. 



