vi PREFACE 



understanding and mastery of the subject are included. These 

 problems are usually given at the beginning of the chapters, so that 

 the pupil may find out for himself many of the facts given later in 

 the text. The pupil can exercise here the true scientific method : 

 examination, observation, and confirmation of his findings. 



The plan of - presenting the subject matter is based on the prac- 

 tical experience in teaching this course for several years to high 

 school pupils by means of mimeographed lesson sheets prepared by 

 various members of the Biology Department of the George Washing- 

 ton High School, New York, N. Y. Changes in these sheets have 

 been made, but much of the material has been elaborated into the 

 present text. The enthusiasm of the Biology Department in the 

 George Washington High School is due largely to the inspiration and 

 support of Harold S. Campbell, Associate Superintendent of the 

 New York high schools. In his annual report of 1928 he included 

 the report of the District Superintendent of High Schools, Dr. John 

 L. Tildsley. In this report, Dr. Tildsley summarized thd objectives 

 of science teaching and said : 



"These objectives call for the creation of a more magnificent 

 self. They call for the expanding of the element of appreciation, 

 the kindling of imagination, the arousing of the sense of admiration 

 and wonder, the excitation of the emotions, the development of the 

 power of accurate observation, the desire for truth, courage to 

 follow the truth, and above all, the setting forth of science as 'a 

 ' way of life.'" 



The authors hope this text will open this broader "way of life" 

 and inspire pupils to think and to act magnificently. 



Thanks are due the Biological Supply Co., New York, for the 

 use of photomicrographs prepared by Mr. Roy M. Allen, and also 

 to Miss Marjorie Fitzpatrick, Mr. Charles Inman, and Mr. Paul B. 

 Mann of New York city high schools, Prof. Ralph Cheney of Long 

 Island University, and Miss Ada Weckel of Oak Park, Illinois, high 

 school, for their critical reading of the manuscript. 



