TABLE OF CONTENTS. XV 



CHAPTER VI. 



PAGE 



LABORATORY EXERCISE FORMS OF LIFE 45 



Objects. To continue training in the observational 

 method; to show the student how to use the work 

 of others to check his own observations and to 

 supplement them, when for any reason he is unable 

 to make them first-hand ; also to enable the student 

 to get some observational distinctions between (i) 

 green plants, (2) fungi, and (3) animals with some 

 appreciation of the fundamental differences in re- 

 spect to their manner of getting the necessary car- 

 bon and nitrogen. 

 Time. 3-6 periods. 



CHAPTER VII. 



PLANTS AND ANIMALS 48 



Objects. To aid the student in systematizing the 

 conclusions of Chapter VI and in putting them into 

 the form of principles or laws; to make him realize 

 the variety of dependence of different living things 

 in respect to food, including human dependence on 

 other organisms. 

 Time. 1-2 periods. 



CHAPTER VIII. 



A REPRESENTATIVE ANIMAL THE LOCUST OR THE 



CRAYFISH 55 



(If there is any danger that these animals will disappear 

 from their haunts before the class reaches this point, it 

 will be better to introduce this chapter immediately after 

 Chapter II.) 



Objects. To cause the student to observe with the 

 utmost care the activities and relations of one ani- 

 mal in its natural environment and to make a 

 complete and accurate record of all that is observed ; 

 to enable him to pass naturally (in his interest) 



