STUDY OF LIVING VERTEBRATES. 107 



14. In what ways do bacteria prove to be of 



benefit 'to mankind ? 



15. In what ways do they prove to be "man's 



invisible foes"? (Read "The Story of 

 Bacteria," "Dust and its Dangers," 

 " Drinking-water and Ice Supplies, and 

 their Relations to Health and Disease," 

 by T. M. Prudden, M.D. Published by 

 G. P. Putnam's Sons.) 



50. STUDY OF LIVING VERTEBRATES. 



A. Habitat. 



1. Does the animal live on land or in water? 



2. In what part of the world is it common? 



3. What is the climate of that region? 



B. Locomotion and breathing. 



4. What appendages has the animal? 



5. Which of these appendages are used in lo- 



comotion? 



6. How many digits of each appendage are 



used? 



7. What method or methods of locomotion 



does the animal have? 



8. In proportion to its size is its locomotion 



rapid or slow? 



9. What other use does the animal make of its 



appendages? 



10. What movements indicate that the animal 



is breathing? 

 C- Food-getting. 



11. What kind of food (animal or vegetable) 



does it eat? 



