36 NATURE-STUDY LESSONS. 



10. (a) Compare a down-{ea.ther with a gtUll-iea.th.et. 

 (b) Discover the chief difference and infer the pur- 

 pose of this difference. 



11. Observe the feathers lying about the hennery, to 

 discover when they are most numerous. 



1 2. Discover whether a hen ever plucks her own feathers 

 out. 



When a hen sheds her feathers she is said lo molt. 



13. Catch a hen that is done molting and observe the 

 new feathers growing. 



The rudimentary feathers, before the vanes have expanded, are the/j«- 

 feathers. 



14. Compare the molting of a hen with the change of 

 covering of a cat, or a dog, or a snake. 



D. Care of the Feathers. 



15. (a) Discover how the hen cleans her feathers. 

 {b) Describe her actions when doing this. 



16. (a) Pour water on a hen, discover whether her 



feathers are waterproof and infer why 

 water runs off the hen. 



{b) Observe the general arrangement of the 

 feathers and infer the purposes. 



E. Flight. 



17. {a) Observe how a hen gets on her roost. 

 {J}) Frighten her and observe her fly. 



{c) Describe the position of the wings in the act of 



flying. 

 (^ Observe the arrangement of the feathers in 



the wings and infer their use in flying. 



