PRACTICAL BIOLOGY 



PART I 



ANIMAL BIOLOGY 



CHAPTER I 



THE GRASSHOPPER, A REPRESENTATIVE ANIMAL 



1. Live Animals. — We all know that animals are alive, 

 just as men and plants are alive, and we naturally want 

 to know how they live, what parts of their bodies they 

 use in eating and breathing, and how they escape their 

 enemies. After we have learned about the lower animals, 

 we can compare them with 

 plants and with man, and it 

 will be interesting to learn 

 in what ways all living 

 things are alike. 



When the study of 

 Biology begins with ani- 

 mals, all that is necessary 



is to select an animal that can be conveniently found 

 and watched ; and then to try to learn where it lives, 

 what it does, how it produces its young, and what 

 relation it has to mankind. Material for study is easily 

 obtained wherever you happen to live, whether in the 

 city, the country town, or on the prairies. A nearby 

 park or vacant lot, the fields, the woods, or the plains, 



u 



Figure 6. — Female Grasshopper. 



