TO 



THE MEMORY OF 



MARTHA FREEMAN GODDARD 



WHOSE DEVOTED INSTRUCTION IN BIOLOGY IS A LASTING 



INFLUENCE FOR GOOD IN THE LIVES OF HUNDREDS 



OF BOYS AND GIRLS AND WHOSE RARE SKILL 



IN LEADERSHIP IS AN INSPIRATION TO 



EVERY TEACHER WHO KNEW HER 



THIS BOOK IS DEDICATED 



BY THE AUTHORS 



450020 



