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PREFACE. 



It has been the Author's aim to embody, in the 

 presect Manual, a succinct resume of what is 

 known concerning those humbler forms of animal 

 life which constitute the department of Protozoa : 

 and in so doing, he has, as much as possible, 

 sought to interpret the observations of others by 

 the light which he has gained from the results of 

 his own investigations. 



A list of the more important memoirs on the 

 Protozoa has been appended to the general ac- 

 count of these animals, in the hope that it may 

 prove useful to those advanced students who may 

 be desirous of entering on their special study. 



Titles are affixed to the numbered paragraphs, 

 both with a view to facilitate reference, and also 

 to guide the junior student in selecting those 

 branches of the subject, with which, on a first 

 perusal, it is most desirable that he should be 

 made familiar. It will be found, however, that 



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