PKEFACE 



THE two fascicles of the first part of this treatise give a more 

 complete account of the Protozoa than is to be found in any 

 similar work hitherto published. Especial attention has been 

 given to the treatment of those groups the Sporozoa r 

 Flagellata, and Hsemoflagellata which have recently acquired 

 so much importance in consequence of the discovery that some 

 of their constituent members are the causes of important 

 diseases in man and animals. 



E. RAY LANKESTEB. 



December 1908. 



