58 NATURE-STUDY LESSONS. 



13. (a) Infer the effect of their work upon the soil. 

 {b) What service is this to the gardener and 



farmer? 



14. Examine the roots of the plants in the box and 

 note whether worms are injurious to them by eating 

 their roots. 



15. In what kind of soil are worms most abundant? 



16. If possible, discover what becomes of worms in 

 very dry weather ; also in winter. 



D. Its Senses. 



17. Touch a worm gently and decide whether it has 

 feeling or not. 



18. Present substances of various odors and decide 

 whether the worm can smell. 



19. Place the worm in a strong light and then darken 

 the room and decide whether the worm can distinguish 

 between light and darkness. 



20. Experiment so as to decide whether it can see 

 objects or not. 



E. The General Appearance and Structure. 



21. {ci) Take a fresh earthworm and examine and 



compare the two ends of the body. 



(b) Which do you think is the forward end and 



which the hinder end? Why? 

 {c) How do the two ends differ ? 



22. {a) Place a worm upon paper and observe its 



movements. 

 {b) Turn it over and note what happens. 



(c) Which is the lower surface of the worm ? 

 {d) Which is the upper surface of the animal ? 

 (g) In what respects do they differ? 



