108 LABORATORY EXERCISE*. 



12. How does the animal seize hold of its food? 



13. Does it chew its food before swallowing? 



14. If possible, describe the teeth. 



D. Means of protection. 



15. Does it have as an outer covering hair, 



feathers, scales, or a naked skin? 



1 6. Of what use to the animal is this outer cov- 



ering? 



17. Is this covering shed by the animal? If so, 



when and how ? 



1 8. What different colors do you find on the 



animal? 



19. Do these colors resemble at all the colors in 



the natural environment of the animal, 

 i.e., is the animal protectively colored? 



20. How can the animal protect itself against 



its enemies? 



E. Sense-organs. 



21. What is the position of the eyes ? How are 



they protected? 



22. Locate the nostrils. Do you see them 



close? 



23. What evidence is there that the animal 



hears? Can you see any ears? If so, 

 describe them. 



51. PARTS OF A COMPOUND MICROSCOPE. 



A. Base. This is the solid foundation on which 

 the instrument rests. It is usually shaped like a 

 horseshoe. 



B. Pillar. The vertical column which is fastened 



