11B BOULDER REVERIES. 



at such a time. But when the breeze, cool and 

 refreshing, fans our brow; or the wind beats 

 against our umbrella or body in strong eddying 

 gusts ; or the hurricane blows steadily for hours 

 over a wide area, leveling forests, dismantling 

 houses, wrecking vessels ; or the tornado strikes 

 with twisting rage a narrow strip, leaving death 

 and destruction in its wake, then man realizes 

 how eager nature is to fill a vacuum. When it 

 is completely filled arid the currents of air have 

 assumed a state of equilibrium, then peaceful 

 calm pervades, and the sun's rays once again 

 beat with vigor upon the unf anned face of earth. 

 How many shades of green in the foliage of 

 our common trees! That of the red oak and 

 beech dark; of the sugar maple lighter; of the 

 sycamore still more pallid, yet all green. Some 

 slight difference in the chemical composition of 

 the chlorophyll or coloring agent is doubtless re- 

 sponsible for this variation in hue. Looking 

 down the valley, I see two greens almost as dis- 

 tinct as though they were red and yellow. One 

 is the dark, almost black hue of the leaves of 

 the papaw and black maple; the other the light 



