PRINCIPLES OF 



ECONOMIC ZOOLOGY 



PART 1 



FIELD AND LABORATORY GUIDE 



TO THE TEACHER 



The purpose of these studies is not to obtain a few facts 

 about the structure and hfe-history of animals, but to lead the 

 student to discover the principles which underlie these facts 

 and to bring him to see that the same fundamental principles 

 apply to all animal life, including man. 



The teacher is entreated not to fail to use the General 

 Studies as indicated, especially upon the forms from Arthro- 

 poda up, and not to be worried because of the repetition of the 

 same questions for different animals. Study to see how these 

 questions may or may not be applied, and why. Remember, 

 we are after principles. The study of the live animal, both in 

 the field and laboratory, will be found to give a new and vital 

 interest to the subject. If you will persevere in the use of 

 these studies as they have been planned, Zoology will grow to 

 have a fascination for you and your students which mere facts, 

 however abundant and accurate, can never give. 



It is not expected that all of these animals will be studied 

 every year. Each teacher must determine the kind and 

 amount of work he can undertake with his classes. He must 

 find out what he can best use and what he can most easily 

 obtain. One year some material may not be obtainable, and 

 another year, easily obtainable; or lack of time or oppor- 

 tunity may necessitate the omission of a certain suggested 

 study. However, these changes will make the work new each 

 year, and students cannot copy from the note-books of the 

 previous year. 



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