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Preface 



THE fourth edition of Protozoology maintains its original aim in 

 setting forth "introductory information on the common and rep- 

 resentative genera of all groups of both free-living and parasitic 

 Protozoa" for seniors and graduates in zoology in colleges and uni- 

 versities. It has been noted in recent years that students frequently 

 wished to obtain a fuller knowledge on certain topics, organisms, 

 processes, etc., than that which was found in the former edition. In 

 order to meet this need without too great an expansion, references 

 have been given to various items in the text and a list of a much 

 larger number of literature has been appended to each chapter. 

 Furthermore, this enlargement of references increases the usefulness 

 of this work to advanced students, teachers of biology, field workers 

 in various areas of biological science, veterinarians, physicians, pub- 

 lic health workers, laboratory diagnosticians and technicians, etc. 



While the chapter arrangement remains the same as before, a 

 thorough revision has been carried on throughout the text in the 

 light of many recently published contributions to protozoology. 

 Good illustrations are indispensable in this kind of work, since they 

 are far more easily comprehended than lengthy statements. There- 

 fore, old illustrations were replaced by more suitable ones and many 

 new illustrations have been added, bringing up the total number of 

 the text figures now to 376. Except diagrams, all figures are accom- 

 panied by the scales of magnification. For illustrations that have 

 been adopted from published papers, the indebtedness of the author 

 is expressed by mentioning the authors' names. 



R. R. Kudo 

 Urbana, Illinois 



