94 MANUAL OF NATURB STUDY. 



ard? hyena? Are these animals in any way de- 

 pendent upon plants ? How ? 



How does the hedge-hog live ? How the mole ? 

 the shrew? ground hog? whippoorwill? bats? 

 These live upon insects. Are they then depend- 

 ent upon plant life ? How ? Suppose all vegeta- 

 tion to be destroyed. Describe the scene that 

 would follow in the animal kingdotti. 



We have already learned that the animal life 

 must have oxygen to breathe, in order to relieve 

 the waste and purify the blood. We also learned 

 that plant life, under the influence of the sun, is 

 continually supplying that oxygen. Plant life 

 demands for its food carbon dioxode; the animal 

 life furnishes this food to the plant. Thus there is 

 a constant interchange of food between the two 

 kingdoms of nature. All the elements necessary 

 for animals' food is in the soil; then why could not 

 animals and man live without plants ? 



Let us illustrate. All the material of our cloth- 

 ing is on the sheep's back or cotton field ; then why 

 do we not go to the sheep's back or cotton field 

 when we need a suit of clothes ? 



All the material of our chairs and school furni- 

 ture, except castings, is found in a sugar, beech, or 

 walnut tree ; then why not go to these trees and 

 load our wagons with some choice furniture to 



