pictures, etc. for the bulletin boards, while others may take charge of pamphlets, reference books, and 

 other special reading material. 



In planning the sequence of exercises it is necessary on the one hand to consider the sequence 

 in which the topics are to be studied, and on the other hand to guard against making the exer- 

 cises mere busy work. Especially important here is the completion of certain exercises while the 

 problems involved are still problems that is, before the solutions are supplied by reading or dis- 

 cussion. In a few cases supplementary work and reading for students are suggested. Further sug- 

 gestions will be found in the Manual for Teachers. 



All the exercises in this Manual have been tried out in actual school experience. The authors 

 are nevertheless deeply indebted for valuable criticisms and suggestions to Dr. Bertha M. Clark of the 

 William Penn High School, Philadelphia ; Mr. Paul B. Mann of the Evander Childs High School, 

 New York ; Dr. A. J. Goldfarb, College of the City of New York ; and Dr. W. H. D. Meier of the 

 State Normal School, Framingham, Massachusetts, who have read the manuscript or the proof and have 

 given us the benefit of their wide experience. 



B. C. G. 

 F. M. W. 



[iv] 



