462 RESEARCH IN PROTOZOOLOGY 



introduction to statistical method. Any worker in the field of pro- 

 tozoology who attempts to apply statistical treatment to his ma- 

 terial will find need for a more complete treatment of the points 

 here introduced, and for a discussion of other phases of the 

 statistical method. For such, refer to the textbooks on the sta- 

 tistical method by the following authors: Fisher (1925), Pearl 

 (1923), and Yule (1927). 



