ON TREES AND BIRDS. 



53 



season, and then think of how their roots plunge away 

 down into the ground and let the water into the soil 

 when it rains, and think how the tops shade the ground 

 and keep it cool in summer, and how the vapors rising 

 in the fall keep away the early autumn frost, and how 

 the cool, sluggish condition of the soil under the shade 

 of the forest trees keeps things backward in spring, so 

 that they do not get nipped by frost, and then think 

 of all the conditions having been changed! Do you 

 wonder, then, that we have changed our climate, and 

 that we are getting winter weather in summer, and 

 vice 'versa ? 



