Research in Protozoology is the fourth volume of a series that covers the progress being made in protozoology. This book is comprised of four chapters and begins with a discussion of synchronized cell division in protozoa, including the species Tetrahymena pyriformes, Astasia longa, Plasmodium lophurae, Amoeba proteus and Acanthamoeba sp., and Physarum polycephalum. The following chapters discuss nuclear phenomena during conjugation and the relationship between protozoa and other animals, with emphasis on parasitism, relations between parasite and host groups, and host specificity. The final chapter focuses on chromosomes and nucleoli in some opalinid protozoa. The book is highly recommended for biologists, microbiologists, zoologists, and parasitologists who want to be updated about the developments in the field of protozoology.