A WORLD-WIDE INTEREST 311 



Throughout this little book an endeavour has been 

 made to emphasize the importance of the study of 

 the parasitic Protozoa to our nation, which is so 

 dependent on its colonies for its daily needs, and has 

 so vast a responsibility as the " Empire on which 

 the sun never sets." The biology of parasitism 

 should have a worldwide interest, not only in con- 

 necting the past with the present, but extending from 

 the present away to the dim horizon of the future. 



