2OO METHODS IN TEACHING 



lying down, and other instinctive acts that persist to link 

 the dog to his wild ancestry. Discuss the wild dogs, 

 wolf, jackal, hyena, dingo, fox. 



Discuss with older pupils the importance of animals in 



subsoiling and admitting air and moisture to the soil. This 



is performed by earthworms, ants, moles, 



SoHlatas fidd mice ' SP hers > P rairie d S s > g round 



squirrels, and by the animals that burrow 



or bury articles; also by the many forms of animal life 

 that hasten the decay of dead trees and other vegetable mat- 

 ter by boring and tunneling, thus letting in air and mois- 

 ture. 



In connection with geography discuss the animal origin 

 of limestone, chalk, ana coral islands. 



