[Other Invertebrate- Animal Study 



465 



tern light. To form some estimate of the work done in a single night, 

 remove the "casts" from a square yard of earth one day, and examine 

 that piece of earth the next. It is well to have a terrarium in the school- 

 room for frequent observation. Scatter grass or dead leaves on top of 

 the soil, and note what happens. For the study of the individual worm 

 and its movements, each pupil should have a worm with some earth upon 

 his desk. 



Observations- i . How does the earthworm crawl? How does it turn 

 over? Has it legs? Compare its movement with that of a snake, 

 another legless animal. What special provision for locomotion has the 

 earthworm ? 



2. Compare the lengths of the contracted and extended body. How 

 accounted for? 



3. Describe the body its shape and color, above and below. 

 Examine the segments. Do all the worms have the same number? 

 Compare the head end with the tail end of the body. Has every worm a 

 "saddle," orclitellum? 



4. Does the earthworm hear easily? Has it eyes? Is it sensible to 

 smell or to touch? What sense is most strongly developed? 



5. Describe the home of the earthworm. Is it occupied by more 

 than one worm ? How long does it take a worm to make a burrow ? How 

 does it protect its home ? How does it make a burrow ? In what kind of 

 soil do you find earthworms at work? 



6. Is the earthworm seen most often at night or by day? Where is 

 it the rest of the time? How does it hold to its burrow? When is the 

 tail end at the top ? When the head end ? 



7. What is the food of the earthworm? How does it get its food? 



8. Look for the eggs of the earthworm about manure piles or under 

 stones. 



9. What are the enemies of the earthworm? Is it a friend or an 

 enemy to us ? Why ? 



10. The earthworm is a good agriculturist. Why? 



Where the crayfish lurks. 



