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     The "Trail Sweeper" using high pressure fog to blow leaves from a path (Brenner device). 
    
   
  
              
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     View of Crescent Glade at the Arboretum (Gray Summit), west of Trail House. 
    
   
  
              
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     View of Long glade from the north at the Arboretum (Gray Summit). 
    
   
  
              
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     View of rocky hillside with natural grove of native cedars at the Arboretum (Gray Summit). 
    
   
  
              
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     View of Brush Creek in flood at the east bridge, May 31, 1942. 
    
   
  
              1942  | 
			
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     Brush Creek in flood, May 31, 1942. 
    
   
  
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     View of Arboretum (Gray Summit) in 1941. 
    
   
  
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     View of Arboretum (Gray Summit) in 1941. 
    
   
  
              1941  | 
			
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     "The Barn" at the Arboretum (Shaw Nature Reserve)
1954-55 
    
   
  
              
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     First cleaning of reservoir at the Arboretum (Gray Summit), about 1949 
    
   
  
              
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